Paper 1:
Atef, A., K. H. Liu, and S.S. Gao (2009),
Apparent weekly and daily earthquake periodicities in the western United States,
Bulletin of the Seismological Society of America, Vol. 99, No. 4, pp. 2273-2279, doi:10.1785/0120080217.

Paper 2:
Gao, S. S., and K. H. Liu (2009),
Significant seismic anisotropy beneath the southern Lhasa Terrane, Tibetan Plateau,
Geochemistry Geophysics Geosystems, 10, Q02008, doi:10.1029/2008GC002227.

Paper 3:
Liu, K.H., and S.S. Gao (2010),
Spatial variations of crustal characteristics beneath the Hoggar swell, Algeria, revealed by systematic analyses of receiver functions from a single seismic station,
Geochemistry Geophysics Geosystems, 11, Q08011, doi:10.1029/2008GC003091.

Paper 4:
Nair, S. K., S. S. Gao, K. H. Liu, and P. G. Silver (2006),
Southern African crustal evolution and composition: Constraints from receiver function studies,
Journal of Geophysical Research, 111, B02304 (17 pages), doi:101029/2005JB003802.

Paper 5:
S.S. Gao, K.H. Liu, et al.,
Characteristics of mantle fabrics beneath the south-central United States: Constraints from shear-wave splitting measurements,
Geosphere v. 4; no. 2; p. 411?417; doi: 10.1130/GES00159.1.