1. Adachi, J., and Hasegawa, M. 1996. MOLPHY: programs for molecular phylogenetics, version 2.3. Institute of Statistical Mathematics, Tokyo.
2. Archie, J. W. 1989. A randomization test for phylogenetic information in systematic data. Syst. Zool.
38:219–252.
3. Barklow, W. 1995. Hippo talk. Nat. Hist.
104:54.
4. Barnes, L. G. 1984. Whales, dolphins, and porpoises: origin and evolution of the Cetacea, in: T. W. B. Broadhead (ed.), Mammals: Notes for a Short Course organized by P. D. Gingerich and C. E. Badgley, pp. 139-158. University of Tennessee Studies in Geology 8.
5. Boyden, A., and Gemeroy, D. 1950. The relative position of the Cetacea among the orders of Mammalia as indicated by precipitin tests. Zoologica
35:145–151.