|  | Ravi P. Agarwal, agarwal@tamuk.edu, Website,  
Texas A&M University, Kingsville, Texas, USA,  56 joint publications | 
|  | Tongxing Li, litongx2007@163.com, Website,  
Shandong University, Jinan, Shandong, China,  26 joint publications | 
|  | Said Grace, saidgrace@yahoo.com, Website,  
Cairo University, Giza, Egypt,  22 joint publications | 
|  | Chenghui Zhang, zchui@sdu.edu.cn, Website,  
Shandong University, Jinan, Shandong, China,  18 joint publications | 
|  | Sabrina Streipert, sas887@pitt.edu, Website,  
University of Pittsburgh, Pittsburgh, Pennsylvania, USA,  15 joint publications | 
|  | Samir Saker, shsaker@mans.edu.eg, Website,  
Mansoura University, Mansoura, Egypt,  15 joint publications | 
|  | Gusein Sh. Guseinov,
  guseinov@atilim.edu.tr, Website,  
Atilim University, Ankara, Turkey,  15 joint publications | 
|  | Ondřej Došlý,
  dosly@math.muni.cz, Website,  
Masaryk University, Brno, Czech Republic,  14 joint publications | 
|  | Shapour Heidarkhani,
  sh.heidarkhani@yahoo.com, Website,  
Razi University, Kermanshah, Iran,  12 joint publications | 
|  | Donal O'Regan, donal.oregan@nuigalway.ie,
  Website,  
National University of Ireland, Galway, Ireland,  11 joint publications | 
|  | Giuseppe Caristi, gcaristi@unime.it, Website,  
University of Messina, Messina, Italy,  11 joint publications | 
|  | Allan Peterson, apeterso@math.unl.edu, Website,  
University of Nebraska, Lincoln, Nebraska, USA,  10 joint publications | 
|  | Josip Pečarić,
  pecaric@element.hr, Website,  
University of Zagreb, Zagreb, Croatia,  9 joint publications | 
|  | Irena Jadlovská, jadlovska@saske.sk,
  Website,  
Slovak Academy of Sciences, Košice, Slovakia,  9 joint publications | 
|  | Werner Kratz, werner.kratz@uni-ulm.de, Website,  
Universität Ulm, Ulm, Germany,  8 joint publications | 
|  | Elvan Akın, akine@mst.edu, Website,  
Missouri University of Science and Technology, Rolla, Missouri, USA,  8 joint publications | 
|  | Hristo Voulov, voulovh@umkc.edu, Website,  
University of Missouri, Kansas City, Missouri, USA,  7 joint publications | 
|  | Ethiraju Thandapani,
  ethandapani@yahoo.co.in, Website,  
University of Madras, Chennai, India,  7 joint publications | 
|  | Jaqueline Mesquita, jgmesquita@unb.br, Website,  
Universidade de Brasília, Brasília, Brazil,  7 joint publications | 
|  | Rabia Bibi, emaorr@gmail.com, Website,  
Hazara University, Mansehra, Pakistan,  7 joint publications | 
|  | Miron Bekker, bekker@pitt.edu, Website,  
University of Pittsburg, Johnstown, Pennsylvania, USA,  7 joint publications | 
|  | Ilgın Sağer, sageri@umsl.edu, Website,  
University of Missouri, St. Louis, Missouri, USA,  6 joint publications | 
|  | Shahin Moradi, shahin.moradi86@yahoo.com,
  Website,  
Razi University, Kermanshah, Iran,  6 joint publications | 
|  | Ivanka Stamova, istamova@abv.bg, Website,  
University of Texas at San Antonio, San Antonio, Texas, USA,  5 joint publications | 
|  | Thomas Matthews, tmnqb@mst.edu, Website,  
Missouri University of Science and Technology, Rolla, Missouri, USA,  5 joint publications | 
|  | Ailian Liu, ailianliu2002@163.com, Website,  
Shandong Economic University, Jinan, Shandong, China,  5 joint publications | 
|  | Snezhana Hristova, snehri@gmail.com, Website,  
Plovdiv University, Plovdiv, Bulgaria,  5 joint publications | 
|  | Zhaocai Hao, zchjal@163.com, Website,  
Qufu Normal University, Qufu, Shandong, China,  5 joint publications | 
|  | Tayeb Benouaz, tayeb.benouaz@gmail.com, Website,  
Université Abou Bekr Belkaid Tlemcen, Tlemcen, Algeria,  5 joint publications | 
|  | Nick Wintz, nwintz@radford.edu, Website,  
Radford University, Radford, Virginia, USA,  4 joint publications | 
|  | Osman Tunç, osmantunc89@gmail.com,
  Website,  
Van University, Van, Turkey,  4 joint publications | 
|  | Tri Truong, tritruongvan@hotmail.com, Website,  
Ostrava University, Ostrava, Czech Republic,  4 joint publications | 
|  | Sanket Tikare,
  sankettikare@rjcollege.edu.in, Website,  
Ramniranjan Jhunjhunwala College, Ghatkopar, Mumbai, India,  4 joint publications | 
|  | Stevo Stević, sstevic@ptt.rs, Website,  
Serbian Academy of Sciences, Belgrade, Serbia,  4 joint publications | 
|  | Roman Šimon Hilscher,
  hilscher@math.muni.cz, Website,  
Masaryk University, Brno, Czech Republic,  4 joint publications | 
|  | Agnieszka Malinowska, abmalina@wp.pl, Website,  
Bialystok University of Technology, Bialystok, Poland,  4 joint publications | 
|  | Başak Karpuz, bkarpuz@gmail.com, Website,  
Dokuz Eylül University, Izmir, Turkey,  4 joint publications | 
|  | Baoguo Jia, mcsjbg@mail.sysu.edu.cn, Website,  
Sun Yat-Sen University, Guangzhou, Guangdong, China,  4 joint publications | 
|  | Meng Fan, mfan@nenu.edu.cn, Website,  
Northeast Normal University, Changchun, China,  4 joint publications | 
|  | Alexander Domoshnitsky, adom@ariel.ac.il,
  Website,  
Ariel University of Samaria, Ariel, Israel,  4 joint publications | 
|  | Churong Chen, churchen@foxmail.com, Website,  
Sun Yat-Sen University, Guangzhou, Guangdong, China,  4 joint publications | 
|  | Rasheed Al Salih, rbahhd@mst.com, Website,  
University of Sumer, Rifai, Iraq,  4 joint publications | 
|  | Jimin Zhang, zhangjm1978@hotmail.com, Website,  
Heilongjiang University, Harbin, Heilongjiang, China,  3 joint publications | 
|  | Patricia J. Y. Wong, ejywong@ntu.edu.sg,
  Website,  
Nanyang Technological University, Singapore, Singapore,  3 joint publications | 
|  | Howard Warth, hlw6c2@mst.edu, Website,  
Missouri University of Science and Technology, Rolla, Missouri, USA,  3 joint publications | 
|  | Adnan Tuna, atuna@nigde.edu.tr, Website,  
Ömer Halisdemir University, Niğde, Turkey,  3 joint publications | 
|  | Shurong Sun, sshrong@163.com, Website,  
University of Jinan, Jinan, Shandong, China,  3 joint publications | 
|  | Olexandr Strakh,
  alexander.strakh@yahoo.com, Website,  
Kiev National University, Kiev, Ukraine,  3 joint publications | 
|  | Olexandr Stanzhytskyi, ostanzh@gmail.com,
  Website,  
Taras Shevchenko National University of Kiev, Kiev, Ukraine,  3 joint publications | 
|  | Gani Trendafilov Stamov,
  gani.stamov@utsa.edu, Website,  
University of Texas at San Antonio, San Antonio, Texas, USA,  3 joint publications | 
|  | Satyam Srivastava,
  satyamsrivastava983@gmail.com, Website,  
Ariel University of Samaria, Ariel, Israel,  3 joint publications | 
|  | Veli Shakhmurov,
  veli.sahmurov@okan.edu.tr, Website,  
Okan University, Istanbul, Turkey,  3 joint publications | 
|  | Srinivasan Selvarangam,
  selvarangam.9962@gmail.com, Website,  
University of Madras, Chennai, India,  3 joint publications | 
|  | Seshadev Padhi, spadhi@bitmesra.ac.in, Website,  
Birla Institute of Technology, Mesra, Ranchi, India,  3 joint publications | 
|  | Donald Lutz, lutzmath@hotmail.com, Website,  
San Diego State University, San Diego, California, USA,  3 joint publications | 
|  | Xiaodi Li, sodymath@163.com, Website,  
Shandong Normal University, Ji'nan, Shandong, China,  3 joint publications | 
|  | Julius Heim, jshxvd@mst.edu, Website,  
Missouri University of Science and Technology, Rolla, Missouri, USA,  3 joint publications | 
|  | Taher Hassan, tshassan@yahoo.com, Website,  
University of Hail, Hail, Saudi Arabia,  3 joint publications | 
|  | Ewa Girejko, e.girejko@pb.edu.pl, Website,  
Bialystok University of Technology, Bialystok, Poland,  3 joint publications | 
|  | Svetlin Georgiev,
  svetlingeorgiev1@gmail.com, Website,  
Sorbonne University, Paris, France,  3 joint publications | 
|  | Tom Cuchta, cuchta@marshall.edu, Website,  
Marshall University, Huntington, West Virginia, USA,  3 joint publications | 
|  | Rotchana Chieochan, rotchana@kku.ac.th, Website,  
Khon Kaen University, Khon Kaen, Thailand,  3 joint publications | 
|  | Sidi Mohammed Amine Bekkouche,
  smabekkouche@yahoo.fr, Website,  
Unité de Recherche Appliquée en Energies Renouvelables, Ghardaia,
  Algeria,  3 joint publications | 
|  | David Barilla, none, Website,  
University of Messina, Messina, Italy,  3 joint publications | 
|  | Josipa Barić, jbaric@fesb.hr, Website,  
University of Split, Split, Croatia,  3 joint publications | 
|  | Yelda Aygar, yelda.aygar@ankara.edu.tr, Website,  
Ankara University, Ankara, Turkey,  3 joint publications | 
|  | Matloob Anwar, matloob_t@yahoo.com, Website,  
National University of Sciences and Technology, Islamabad, Pakistan,  3 joint publications | 
|  | Muhammad Ahsan, ahsankog@uoswabi.edu.pk,
  Website,  
University of Swabi, Swabi, Khyber Pakhtunkhwa, Pakistan,  3 joint publications | 
|  | Calvin Ahlbrandt,
  calvin@fourier.math.missouri.edu, Website,  
University of Missouri, Columbia, Missouri, USA,  3 joint publications | 
|  | Nemat Abazari, abazari@uma.ac.ir, Website,  
Mohaghegh Ardabili University, Ardabil, Iran,  3 joint publications | 
|  | Yusuf M. Yaylı,
  yayli@science.ankara.edu.tr, Website,  
Ankara University, Ankara, Turkey,  2 joint publications | 
|  | Cemil Tunç, cemtunc@yahoo.com, Website,  
Van University, Van, Turkey,  2 joint publications | 
|  | Delfim F. M. Torres, delfim@ua.pt, Website,  
University of Aveiro, Aveiro, Portugal,  2 joint publications | 
|  | Christopher C. Tisdell, cct@unsw.edu.au,
  Website,  
University of New South Wales, Sydney, South Wales, Australia,  2 joint publications | 
|  | Nasrin Sultana, nsq4d@mst.edu, Website,  
Missouri University of Science and Technology, Rolla, Missouri, USA,  2 joint publications | 
|  | Ioannis Stavroulakis, ipstav@cc.uoi.gr, Website,  
University of Ioannina, Ioannina, Greece,  2 joint publications | 
|  | Radkhakrishnan Srinivasan,
  selvarangam.9962@gmail.com, Website,  
SRM Institute of Science and Technology, Chennai, India,  2 joint publications | 
|  | Cvetelina Spirova, cvetelina2802@abv.bg,
  Website,  
Technical University Sofia, Sliven, Bulgaria,  2 joint publications | 
|  | Alireza Sedaghatdoost,
  alirezasedaghatdoost@gmail.com, Website,  
Mohaghegh Ardabili University, Ardabil, Iran,  2 joint publications | 
|  | Baruch Schneider, Baruch.Schneider@osu.cz,
  Website,  
Ostrava University, Ostrava, Czech Republic,  2 joint publications | 
|  | Suman Sanyal,
  suman.sanyal@niituniversity.in, Website,  
NIIT University, Gurgaon, India,  2 joint publications | 
|  | Amjad Salari, amjads45@yahoo.com, Website,  
Razi University, Kermanshah, Iran,  2 joint publications | 
|  | Sandra Pinelas, sandra.pinelas@gmail.com,
  Website,  
Academia Militar, Amadora, Portugal,  2 joint publications | 
|  | Mahmoud M. Osman, mmosman@mans.edu.eg, Website,  
Mansoura University, Mansoura, Egypt,  2 joint publications | 
|  | Ammara Nosheen, hafiza_amara@yahoo.com,
  Website,  
University of Sargodha, Sargodha, Pakistan,  2 joint publications | 
|  | Linh Nguyen, nguyenletoannhatlinh@tdtu.vn,
  Website,  
Ostrava University, Ostrava, Czech Republic,  2 joint publications | 
|  | Anatolii Andreevich Martynyuk,
  martynyukanan@gmail.com, Website,  
National Academy of Sciences of Ukraine, Kiev, Ukraine,  2 joint publications | 
|  | Ramy R. Mahmoud, rrm00@fayoum.edu.eg, Website,  
Fayoum University, Fayoum, Egypt,  2 joint publications | 
|  | Hugo Leiva, hleiva@yachaytech.edu.ec, Website,  
Yachay Tech, Urcuquí, Ecuador,  2 joint publications | 
|  | Weidong Lei, leiwd@hit.edu.cn, Website,  
Harbin Insitute of Technology, Shenzhen, Guangdong, China,  2 joint publications | 
|  | Amir Ali Khan, Website,  
University of L'Aquila, L'Aquila, Italy,  2 joint publications | 
|  | Veysel Fuat Hatipoğlu,
  fuathatipoglu@yahoo.com, Website,  
Muğla Sıtkı Koçman University, Muğla, Turkey,  2 joint publications | 
|  | Alaa E. Hamza, hamzaaeg2003@yahoo.com, Website,  
Cairo University, Giza, Cairo, Egypt,  2 joint publications | 
|  | Fariba Gharehgazlouei,
  f.gharehgazloo@yahoo.com, Website,  
Razi University, Kermanshah, Iran,  2 joint publications | 
|  | Gregory Gelles, gelles@mst.edu, Website,  
Missouri University of Science and Technology, Rolla, Missouri, USA,  2 joint publications | 
|  | Rui A. C. Ferreira, raferreira@fc.ul.pt,
  Website,  
University of Lisbon, Lisbon, Portugal,  2 joint publications | 
|  | Lynn Erbe, lerbe@math.unl.edu, Website,  
University of Nebraska, Lincoln, Nebraska, USA,  2 joint publications | 
|  | Hassan El-Morshedy,
  elmorshedy@hotmail.com, Website,  
Damietta University, New Damietta, Egypt,  2 joint publications | 
|  | Cosme Duque, cosduq@gmail.com, Website,  
University of Los Andes, Mérida, Venezuela,  2 joint publications | 
|  | George Chatzarakis, geaxatz@otenet.gr, Website,  
School of Pedagogical and Technological Education, Athens, Greece,  2 joint publications | 
|  | Fatma Ayça Çetinkaya,
  faycacetinkaya@mersin.edu.tr, Website,  
Mersin University, Mersin, Turkey,  2 joint publications | 
|  | Hüseyin Budak,
  huseyinbudak@duzce.edu.tr, Website,  
Düzce University, Düzce, Turkey,  2 joint publications | 
|  | Mouffak Benchohra, benchohra@yahoo.com, Website,  
Université Djilali-Liabes Sidi Bel Abbes, Sidi Bel Abbes, Algeria,  2 joint publications | 
|  | Maryam Alghamdi, none, Website,  
University of Jeddah, Jeddah, Saudi Arabia,  2 joint publications | 
|  | Murat Adıvar, madivar@uncfsu.edu, Website,  
Fayetteville State University, Fayetteville, North Carolina, USA,  2 joint publications | 
|  | Saïd Abbas, abbasmsaid@yahoo.fr, Website,  
University of Saïda, Saïda, Algeria,  2 joint publications | 
|  | Weichen Zhou, Website,  
Qufu Normal University, Qufu, Shandong, China,  1 joint publication | 
|  | Yao Zheng, yzheng2@niu.edu, Website,  
Northern Illinois University, DeKalb, Illinois, USA,  1 joint publication | 
|  | Liancun Zheng, liancunzheng@sina.com, Website,  
Beijing University of Science and Technology, Beijing, China,  1 joint publication | 
|  | Xueyan Zhang, zxyzhcn@163.com, Website,  
Qufu Normal University, Qufu, Shandong, China,  1 joint publication | 
|  | Haoran Zhang, Website,  
Qufu Normal University, Qufu, Shandong, China,  1 joint publication | 
|  | Agacik Zafer, agacik.zafer@gmail.com, Website,  
American University of the Middle East, Kuwait,  1 joint publication | 
|  | Awais Younus, awais@bzu.edu.pk, Website,  
Bahauddin Zakariya University, Multan, Pakistan,  1 joint publication | 
|  | Gail S. K. Wolkowicz,
  wolkowic@mcmaster.ca, Website,  
McMaster University, Hamilton, Ontario, Canada,  1 joint publication | 
|  | Junjun Wang, uwenhao98@163.com, Website,  
Qufu Normal University, Qufu, Shandong, China,  1 joint publication | 
|  | Chuan-Kui Wang, wcksdnu@163.com, Website,  
Shandong Normal University, Jinan, Shandong, China,  1 joint publication | 
|  | Tammy Voepel, tvoepel@siue.edu, Website,  
Southern Illinois University, Edwardsville, Illinois, USA,  1 joint publication | 
|  | Kumar S. Vidhyaa, none, Website,  
SRM University, Ramapuram, India,  1 joint publication | 
|  | Sanja Varošanec, varosans@math.hr,
  Website,  
University of Zagreb, Zagreb, Croatia,  1 joint publication | 
|  | Ngo Van Hoa, hoa.ngovan@vlu.edu.vn, Website,  
Van Lang University, Ho Chi Minh City, Vietnam,  1 joint publication | 
|  | Claudia Valls, cvalls@math.ist.utl.pt, Website,  
University of Lisbon, Lisbon, Portugal,  1 joint publication | 
|  | Mehmet Ünal, munal@sinop.edu.tr, Website,  
Sinop University, Sinop, Turkey,  1 joint publication | 
|  | Alexander P. Ugol'nikov,
  kafedravm_onaft@ukr.net, Website,  
Odessa State Academy, Odessa, Ukraine,  1 joint publication | 
|  | Ercan Tunç, ercantunc72@yahoo.com,
  Website,  
Gaziosmanşa University, Tokat, Turkey,  1 joint publication | 
|  | Krishnan Thangavelu,
  kthangavelu14@gmail.com, Website,  
Pachaiyappa's College, Chennai, India,  1 joint publication | 
|  | Shuhong Tang, wfxytang@163.com, Website,  
Weifang University, Weifang, Shandong, China,  1 joint publication | 
|  | Balakrishnan Sudha, sudhabala10@gmail.com,
  Website,  
SRM Institute of Science and Technology, Chennai, India,  1 joint publication | 
|  | Kremena Stefanova,
  kstefanova@uni-plovdiv.bg, Website,  
University of Plovdiv, Plovdiv, Bulgaria,  1 joint publication | 
|  | Vadrevu Sree Hari Rao, vshrao@yahoo.com,
  Website,  
Jawaharlal Nehru Technological University, Hyderabad, India,  1 joint publication | 
|  | Zoraida Sivoli, zoraidasivoli@gmail.com,
  Website,  
Universidad Siglo 21, Cordoba, Argentina,  1 joint publication | 
|  | Deeksha Singh, deekshas905@gmail.com, Website,  
Indian Institute of Technology (IIT-BHU), Varanasi, India,  1 joint publication | 
|  | Ali Shokri, none, Website,  
University of Maragheh, Maragheh, Iran,  1 joint publication | 
|  | Muhammad Awais Shaikh, none, Website,  
University of Karachi, Karachi, Pakistan,  1 joint publication | 
|  | Manuel de la Sen, manuel.delasen@ehu.eus,
  Website,  
University of the Basque Country, Bilbao, Spain,  1 joint publication | 
|  | Pallavi S. Scindia, none, Website,  
Dhole Patil College of Engineering, Alandi, India,  1 joint publication | 
|  | Muhammad Shoaib Saleem,
  hod.math@uo.edu.pk, Website,  
Okara University, Okara, Pakistan,  1 joint publication | 
|  | Ahmed Saied, saied@saske.sk, Website,  
Slovak Academy of Sciences, Košice, Slovakia,  1 joint publication | 
|  | S. A. Rupadevi,
  selvarangam.9962@gmail.com, Website,  
University of Madras, Chennai, India,  1 joint publication | 
|  | Stefanía Rodríguez,
  srodrig7@eafit.edu.co, Website,  
Universidad Escuela de Administración, Finanzas y Tecnología,
  Medellín, Colombia,  1 joint publication | 
|  | Jerry Ridenhour,
  jerry.ridenhour@gmail.com, Website,  
Utah State University, Logan, Utah, USA,  1 joint publication | 
|  | Pavel Řehák, rehak@math.cas.cz,
  Website,  
Masaryk University, Brno, Czech Republic,  1 joint publication | 
|  | Bose Rani, none, Website,  
University of Madras, Chennai, India,  1 joint publication | 
|  | Higinio Ramos, none, Website,  
University of Salamanca, Salamanca, Spain,  1 joint publication | 
|  | Gauhar Rahman, gauhar55uom@gmail.com, Website,  
International Islamic University Islamabad, Islamabad, Pakistan,  1 joint publication | 
|  | Yong Pei, py801@163.com, Website,  
Nanjing University of Aeronautics and Astronautics, Nanjing, Jiangsu, China,
   1 joint publication | 
|  | Rajesh Pandey, rkpandey.mat@itbhu.ac.in,
  Website,  
Indian Institute of Technology (IIT-BHU), Varanasi, India,  1 joint publication | 
|  | Abdullah Özbekler,
  aozbekler@gmail.com, Website,  
Atilim University, Ankara, Turkey,  1 joint publication | 
|  | Mohamed Ouahi, mohamed.ouahi@usmba.ac.ma,
  Website,  
Université Sidi Mohamed Ben Abdellah, Fez, Morocco,  1 joint publication | 
|  | Özkan Öcalan,
  ozkanocalan@akdeniz.edu.tr, Website,  
Akdeniz University, Anatalya, Turkey,  1 joint publication | 
|  | Eze Nwaeze, enwaeze@tuskegee.edu, Website,  
Tuskegee University, Tuskegee, Alabama, USA,  1 joint publication | 
|  | Mark Adolfovich Nudel'man, mark@te.net.ua,
  Website,  
Integrated Banking Information Systems, Odessa, Ukraine,  1 joint publication | 
|  | Kottakkaran Sooppy Nisar,
  n.sooppy@psau.edu.sa, Website,  
Prince Sattam bin Abdulaziz University, Wadi Al Dawasir, Saudi Arabia,  1 joint publication | 
|  | Juan E. Nápoles Valdés, none, Website,  
Universidas Nacional del Nordeste, Corrientes, Argentina,  1 joint publication | 
|  | Mokhtar A. A. Naby, none, Website,  
Ain Shams University, Cairo, Egypt,  1 joint publication | 
|  | Ghali Naami, ghali.naami@usmba.ac.ma, Website,  
Université Sidi Mohamed Ben Abdellah, Fez, Morocco,  1 joint publication | 
|  | Shahid Mubeen, smjhanda@uos.edu.pk, Website,  
University of Sargodha, Sargodha, Punjab, Pakistan,  1 joint publication | 
|  | Toufik Moussaoui, moussaoui@ens-kouba.dz,
  Website,  
École Normale Supérieure, Kouba, Algeria,  1 joint publication | 
|  | Maria Luisa Ribeiro dos Santos Morgado,
  none, Website,  
Universidade de Trás-os-Montes e Alto Douro, Vila Real, Portugal,  1 joint publication | 
|  | Jonnalagadda Jagan Mohan,
  j.jaganmohan@hotmail.com, Website,  
Birla Institute of Technology and Science, Pilani, Hyderabad, India,  1 joint publication | 
|  | Pshtiwan Oahtman Mohammed, none, Website,  
University of Sulaimani, Sulaimanya, Iraq,  1 joint publication | 
|  | Mouataz Billah Mesmouli,
  m.mesmouli@uoh.edu.sa, Website,  
University of Hail, Hail, Saudi Arabia,  1 joint publication | 
|  | Faraz Mehmood, none, Website,  
Dawood University, Karachi, Pakistan,  1 joint publication | 
|  | Mohammad Mehdizadeh Khalsaraei, none, Website,  
University of Maragheh, Maragheh, Iran,  1 joint publication | 
|  | Freddy Marín Sánchez,
  fmarinsa@eafit.edu.co, Website,  
Universidad Escuela de Administración, Finanzas y Tecnología,
  Medellín, Colombia,  1 joint publication | 
|  | Vasile Lupulescu, vasile@utgjiu.ro, Website,  
Constantin Brancusi University, T{\^a}acirc;rgu Jiu, Romania,  1 joint publication | 
|  | Hua Luo, luohuadufe@163.com, Website,  
Northeast University of Finance and Economics, Dalian, Liaon, China,  1 joint publication | 
|  | Qingmin Liu, litongx2007@163.com, Website,  
Shandong Yingcai University, Jinan, Shandong, China,  1 joint publication | 
|  | Elena Litsyn, elitsyn@gmail.com, Website,  
Ariel University of Samaria, Ariel, Israel,  1 joint publication | 
|  | Kumari Lipi, chaudhary.lipi123@gmail.com,
  Website,  
Indian Institute of Technology, Rorkee, India,  1 joint publication | 
|  | Wan-Tong Li, wtli@lzu.edu.cn, Website,  
Lanzhou University, Lanzhou, Gansu, China,  1 joint publication | 
|  | Olga Lavrova, lavrova_olia@mail.ru, Website,  
Taras Shevchenko National University of Kiev, Kiev, Ukraine,  1 joint publication | 
|  | Fatiha Lassouani, tayeb.benouaz@gmail.com,
  Website,  
Université Abou Bekr Belkaid Tlemcen, Tlemcen, Algeria,  1 joint publication | 
|  | Vangipuram Lakshmikantham,
  lakshmik@fit.edu, Website,  
Florida Institute of Technology, Melbourne, Florida, USA,  1 joint publication | 
|  | Hikmet Koyunbakan, hkoyunbakan@gmail.com,
  Website,  
Firat University, Elazig, Turkey,  1 joint publication | 
|  | Erdal Korkmaz, korkmazerdal36@hotmail.com,
  Website,  
Muş Alparslan University, Muş, Turkey,  1 joint publication | 
|  | Nurten Kılıç, none, Website,  
Dumlupınar University, Küthaya, Turkey,  1 joint publication | 
|  | Maria Khan, none, Website,  
University of Karachi, Karachi, Pakistan,  1 joint publication | 
|  | Asif Raza Khan, asifrk@uok.edu.pk, Website,  
University of Karachi, Karachi, Pakistan,  1 joint publication | 
|  | Kenzhegaly Kenzhebaev,
  eac_aktobe@nursat.kz, Website,  
K. Zhubanov Aktobe Regional State University, Aktobe, Kazakhstan,  1 joint publication | 
|  | Billur Kaymakçalan,
  billurkaymakcalan@gmail.com, Website,  
Çankaya University, Ankara, Turkey,  1 joint publication | 
|  | Artion Kashuri, artionkashuri@gmail.com,
  Website,  
University of Vlora, Vlore, Albania,  1 joint publication | 
|  | Olga Karpenko, olyakare@gmail.com, Website,  
Taras Shevchenko National University of Kiev, Kiev, Ukraine,  1 joint publication | 
|  | Touria Karite, touria.karite@usmba.ac.ma,
  Website,  
Université Sidi Mohamed Ben Abdellah, Fez, Morocco,  1 joint publication | 
|  | Hasan Kara, hasan64kara@gmail.com, Website,  
Düzce University, Düzce, Turkey,  1 joint publication | 
|  | Rozarija Jakšić,
  jaksic.rozarija@gmail.com, Website,  
University of Zagreb, Zagreb, Croatia,  1 joint publication | 
|  | Erhan Inci, incierhan@gmail.com, Website,  
Atilim University, Ankara, Turkey,  1 joint publication | 
|  | Loredana-Florentina Iambor,
  iambor.loredana@uoradea.ro, Website,  
University of Oradea, Oradea, Romania,  1 joint publication | 
|  | Stefen Hui, hui@math.sdsu.edu, Website,  
San Diego State University, San Diego, California, USA,  1 joint publication | 
|  | Thomas Hudson, tch44f@mst.edu, Website,  
Missouri University of Science and Technology, Rolla, Missouri, USA,  1 joint publication | 
|  | Wenhao Hu, uwenhao98@163.com, Website,  
Qufu Normal University, Qufu, Shandong, China,  1 joint publication | 
|  | Fatih Hezenci, fatihhezenci@duzce.edu.tr,
  Website,  
Düzce University, Düzce, Turkey,  1 joint publication | 
|  | Roger Hering, hering@mst.edu, Website,  
Missouri University of Science and Technology, Rolla, Missouri, USA,  1 joint publication | 
|  | Alexander Herega, a.herega@gmail.com, Website,  
Odessa State Academy, Odessa, Ukraine,  1 joint publication | 
|  | Johnny Henderson,
  Johnny_Henderson@baylor.edu, Website,  
Baylor University, Waco, Texas, USA,  1 joint publication | 
|  | Bipan Hazarika, none, Website,  
Gauhati University, Guwahati, India,  1 joint publication | 
|  | Meihong Guan, liancunzheng@sina.com, Website,  
Beijing University of Science and Technology, Beijing, China,  1 joint publication | 
|  | John Graef, John-Graef@utc.edu, Website,  
University of Tennessee, Chattanooga, Tennessee, USA,  1 joint publication | 
|  | Yakov Goltser, goltser@ariel.ac.il, Website,  
Ariel University of Samaria, Ariel, Israel,  1 joint publication | 
|  | Mathias Göggel, mgz67@mst.edu, Website,  
Missouri University of Science and Technology, Rolla, Missouri, USA,  1 joint publication | 
|  | Fouad Giri, fouad.giri@unicaen.fr, Website,  
Université de Caen Basse Normandie, Caen, France,  1 joint publication | 
|  | Ahmad Ghobadi, ahmad.673.1356@gmail.com,
  Website,  
Razi University, Kermanshah, Iran,  1 joint publication | 
|  | Atanaska Georgieva,
  atanaska@uni-plovdiv.bg, Website,  
University of Plovdiv, Plovdiv, Bulgaria,  1 joint publication | 
|  | Srinivasan Geetha,
  srigeethamano@gmail.com, Website,  
University of Madras, Chennai, India,  1 joint publication | 
|  | Armengol Gasull, gasull@mat.uab.cat, Website,  
Universitat Aut{\`o}noma de Barcelona, Barcelona, Spain,  1 joint publication | 
|  | Nicholas Fewster-Young,
  Nick.Fewster-Young@unisa.edu.au, Website,  
University of New South Wales, Sydney, South Wales, Australia,  1 joint publication | 
|  | José Manuel Ferreira,
  jferr@math.ist.utl.pt, Website,  
Technical University of Lisbon, Lisbon, Portugal,  1 joint publication | 
|  | Marcia Federson, federson@icmc.usp.br, Website,  
University of São Paulo, São Carlos, Brazil,  1 joint publication | 
|  | Paul Eloe, peloe1@udayton.edu, Website,  
University of Dayton, Dayton, Ohio, USA,  1 joint publication | 
|  | Uri Elias, elias@tx.technion.ac.il, Website,  
Technion, Israel Institute of Technology, Haifa, Israel,  1 joint publication | 
|  | Oktay Duman, oduman@etu.edu.tr, Website,  
TOBB University of Economics and Technology, Ankara, Turkey,  1 joint publication | 
|  | Iguer Luis Domini dos Santos, none, Website,  
Universidade Estadual Paulista (UNESP), Ilha Solteira, Brazil,  1 joint publication | 
|  | Smaïl Djebali, djebali@hotmail.com,
  Website,  
École Normale Supérieure, Kouba, Algeria,  1 joint publication | 
|  | Chinnappa Pillai Dharuman,
  cdharuman55@gmail.com, Website,  
SRM Institute of Science and Technology, Ramapuram, Chennai, India,  1 joint publication | 
|  | Soniya Dhama, soniyad@rgipt.ac.in, Website,  
Rajiv Gandhi Institute of Petroleum Technology, Amethi Jais, Uttar Pradesh,
  India,  1 joint publication | 
|  | John Davis, John_M_Davis@baylor.edu,
  Website,  
Baylor University, Waco, Texas, USA,  1 joint publication | 
|  | Fozi Dannan, fmdan@scs-net.org, Website,  
Arab European University, Damaskus, Syria,  1 joint publication | 
|  | Stephen Clark, sclark@mst.edu, Website,  
Missouri University of Science and Technology, Rolla, Missouri, USA,  1 joint publication | 
|  | Abdelhak Chikhaoui,
  tayeb.benouaz@gmail.com, Website,  
Université Abou Bekr Belkaid Tlemcen, Tlemcen, Algeria,  1 joint publication | 
|  | Wing-Sum Cheung, wscheung@maths.hku.hk, Website,  
University of Hong Kong, Pokfulam, Hong Kong,  1 joint publication | 
|  | Shaozhu Chen, szchen@sdu.edu.cn, Website,  
Shandong University at Weihai, Weihai, Shandong, China,  1 joint publication | 
|  | Şerifenur Cebesoy,
  scebesoy@karatekin.edu.tr, Website,  
Çankırı Karatekin University, Çankırı, Turkey,  1 joint publication | 
|  | Jose Castillo, jcastillo@mail.sdsu.edu, Website,  
San Diego State University, San Diego, California, USA,  1 joint publication | 
|  | Anastasiia Bratochkina,
  sestri4kina@ukr.net, Website,  
Taras Shevchenko National University of Kiev, Kiev, Ukraine,  1 joint publication | 
|  | Alexander Boichuk, boichuk@imath.kiev.ua,
  Website,  
National Academy of Sciences of Ukraine, Kiew, Ukraine,  1 joint publication | 
|  | Sigrun Bodine, sbodine@pugetsound.edu, Website,  
University, Tacoma, Washington, USA,  1 joint publication | 
|  | Li Bi, mfan@nenu.edu.cn, Website,  
Northeast Normal University, Changchun, Jilin, China,  1 joint publication | 
|  | Puja Bharti, pujab@rgipt.ac.in, Website,  
Rajiv Gandhi Institute of Petroleum Technology, Amethi Jais, Uttar Pradesh,
  India,  1 joint publication | 
|  | Imran Abbas Baloch,
  iabbasbaloch@gmail.com, Website,  
GC University Lahore, Lahore, Pakistan,  1 joint publication | 
|  | Hira Ashraf Baig, habaig@iba.edu.pk, Website,  
Institute of Business Administration, Karachi, Pakistan,  1 joint publication | 
|  | Waqas Ali Azhar, waqas.azhar@lums.edu.pk,
  Website,  
Lahore University of Management Sciences, Lahore, Pakistan,  1 joint publication | 
|  | Farahnaz Ayazi, none, Website,  
Razi University, Kermanshah, Iran,  1 joint publication | 
|  | Heba Mohamed Arafa, none, Website,  
Ain Shams University, Cairo, Egypt,  1 joint publication | 
|  | Serkan Aracı, mtsrkn@hotmail.com, Website,  
Hasan Kalyoncu University, Gaziantep, Turkey,  1 joint publication | 
|  | Douglas R. Anderson, andersod@cord.edu, Website,  
Concordia University, Moorhead, Minnesota, USA,  1 joint publication | 
|  | Jehad Alzabut, jalzabut@psu.edu.sa, Website,  
Prince Sultan University, Riyadh, Saudi Arabia,  1 joint publication | 
|  | Ahmed Alsaedi, aalsaedi@hotmail.com, Website,  
King Abdulaziz University, Jeddah, Saudi Arabia,  1 joint publication | 
|  | Ricardo Almeida, none, Website,  
University of Aveiro, Aveiro, Portugal,  1 joint publication | 
|  | Alaa Aljehani, none, Website,  
University of Jeddah, Jeddah, Saudi Arabia,  1 joint publication | 
|  | Fikret Aliev, none, Website,  
Baku State University, Baku, Azerbaijan,  1 joint publication | 
|  | Mymonah Alharbi, none, Website,  
University of Jeddah, Jeddah, Saudi Arabia,  1 joint publication | 
|  | Boshra Alharbi,
  balharbi0383@stu.kau.edu.sa, Website,  
King Abdulaziz University, Jeddah, Saudi Arabia,  1 joint publication | 
|  | Faysal Akın, akinff@dicle.edu.tr, Website,  
Dicle University, Diyarbakir, Turkey,  1 joint publication | 
|  | Samir Aibout, none, Website,  
University of Saïda, Saïda, Algeria,  1 joint publication | 
|  | Naveed Ahmad, naveedahmad@iba.edu.pk, Website,  
Institute of Business Administration, Karachi, Pakistan,  1 joint publication | 
|  | Bashir Ahmad,
  bashirahmad_qau@yahoo.com, Website,  
King Abdulaziz University, Jeddah, Saudi Arabia,  1 joint publication | 
|  | Dov Aharonov, dova@tx.technion.ac.il, Website,  
Technion, Israel Institute of Technology, Haifa, Israel,  1 joint publication | 
|  | Hassan Ahmed Hassan Agwa, none, Website,  
Ain Shams University, Cairo, Egypt,  1 joint publication | 
|  | Purshottam Agrawal,
  pna_iitr@yahoo.co.in, Website,  
Indian Institute of Technology, Rorkee, India,  1 joint publication | 
|  | Ghasem Afrouzi, afrouzi@umz.ac.ir, Website,  
University of Mazandaran, Babol Sar, Iran,  1 joint publication | 
|  | Amir Abdel Menaem, ashassan@mans.edu.eg,
  Website,  
Mansoura University, Mansoura, Egypt,  1 joint publication |