Geptner, V.G., Sludskii, A. A., (1972) Mlekopitaiuščie Sovetskogo Soiuza. Vysšaia Škola, Moskva. (In Russian; English translation: Heptner, V.G.; Sludskii, A.A.; Bannikov, A.G.; (1992) Mammals of the Soviet Union. Volume II, Part 2: Carnivora (Hyaenas and Cats). Smithsonian Institution and the National Science Foundation, Washington DC). Pp. 95–202