Project 420: M. A. O'Leary, B. A. Patel, M. N. Coleman. 2012. New data on the petrosal of Bothriogenys (Mammalia, Artiodactyla, Anthracotheriidae), and petrosal volume and density comparisons among aquatic and terrestrial artiodactyls and outgroups. Journal of Paleontology. 86 (1):44-50.