9Morgan M E, Kingston J D, Marino B D. Carbon isotopic evidence for the emergence of Ca plants in the Neogene from Pakistan and Kenya[J]. Nature, 1994,367:162 - 165.
10Quade J,Cerling T E,Barry J C,et al. A 16 - Ma record of paleodiet using carbon and oxygen isotopes in fossil teeth from Pakistan[ J]. Chemical Geology, 1992,94 : 183 - 192.
