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O'Leary, M. A., B. A. Patel and 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. Vol. 86(1), pp. 44-50.