Gingerich, Philip D. et al 1983. Origin of whales in epicontinental remnant seas: new evidence from the early Eocene of Pakistan. Science. 220 (4595): 403–6. . PMID 17831411.
Gingerich, Philip D. et al 1983. Origin of whales in epicontinental remnant seas: new evidence from the early Eocene of Pakistan. Science. 220 (4595): 403–6. . PMID 17831411.