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Thewissen, J. G. M.; Williams, E. M., Roe, L. J., Hussain, S. T. (19 September 2001), “Skeletons of terrestrial cetaceans and the relationship of whales to artiodactyls”, Nature413 (6853): 277–281, doi:10.1038/35095005, PMID11565023
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Thewissen, J. G. M.; Cooper, Lisa Noelle, Clementz, Mark T., Bajpai, Sunil, Tiwari, B. N. (20 December 2007), “Whales originated from aquatic artiodactyls in the Eocene epoch of India”, Nature450 (7173): 1190–1194, Bibcode: 2007Natur.450.1190T, doi:10.1038/nature06343, PMID18097400
Thewissen, J. G. M.; Cooper, Lisa Noelle, Clementz, Mark T., Bajpai, Sunil, Tiwari, B. N. (20 December 2007), “Whales originated from aquatic artiodactyls in the Eocene epoch of India”, Nature450 (7173): 1190–1194, Bibcode: 2007Natur.450.1190T, doi:10.1038/nature06343, PMID18097400
Thewissen, J. G. M.; Cooper, Lisa Noelle, Clementz, Mark T., Bajpai, Sunil, Tiwari, B. N. (20 December 2007), “Whales originated from aquatic artiodactyls in the Eocene epoch of India”, Nature450 (7173): 1190–1194, Bibcode: 2007Natur.450.1190T, doi:10.1038/nature06343, PMID18097400
Nummela, Sirpa; Thewissen, J. G. M., Bajpai, Sunil, Hussain, S. Taseer, Kumar, Kishor (11 August 2004), “Eocene evolution of whale hearing”, Nature430 (7001): 776–778, doi:10.1038/nature02720, PMID15306808
J. G. M. Thewissen, E. M. Williams, L. J. Roe and S. T. Hussain (2001), “Skeletons of terrestrial cetaceans and the relationship of whales to artiodactyls”, Nature413 (6853): 277–281, doi:10.1038/35095005, PMID11565023
Thewissen, J. G. M.; Cooper, Lisa Noelle, Clementz, Mark T., Bajpai, Sunil, Tiwari, B. N. (20 December 2007), “Whales originated from aquatic artiodactyls in the Eocene epoch of India”, Nature450 (7173): 1190–1194, Bibcode: 2007Natur.450.1190T, doi:10.1038/nature06343, PMID18097400
Thewissen, J. G. M.; Williams, E. M., Roe, L. J., Hussain, S. T. (19 September 2001), “Skeletons of terrestrial cetaceans and the relationship of whales to artiodactyls”, Nature413 (6853): 277–281, doi:10.1038/35095005, PMID11565023
Spoor, F.; Bajpai, S., Hussain, S. T., Kumar, K., Thewissen, J. G. M. (8 May 2002), “Vestibular evidence for the evolution of aquatic behaviour in early cetaceans”, Nature417 (6885): 163–166, doi:10.1038/417163a, PMID12000957