Billia, E.M. 2007. Otlichitel’nye osobennosti cherepov Coelodonta antiquitatis (Blumenbach, 1799) i Stephanorhinus kirchbergensis (Jäger, 1839) (Mammalia, Rhinocerotidae) [C. antiquitatis (Blum., 1799) and S. kirchbergensis (Jäger, 1839) (Mammalia, Perissodactyla) cranial distinguishing characters].