1. Agadzhanian A. K., 1980. Pleistocene mammalian fauna of Chukotka and main stages of its information. In: The late deposits and the Pleistocene paleography of Chukotka, Moscow, 256?268 (Russian).
2. Allen, G. M., 1914. Notes on the birds and mammals of the aretic coast of East Siberia. Mammals. Proc. New Engl. zool. Club 5: 49?66.
3. Arnason, U., 1980. C-and G-banded karyotypes of three delphinids: Stenella elymene, Lagenorhynchus albirostris and Phocoena phocoena. Hereditas 92: 179?187.
4. Bobrinsky, N. A., Kuznetsov, B. A. & Kuzyakin, A. P., 1944. Mammals of the USSR. Moscow (Russian).
5. Bykova, G. V., 1977. The chromosome complement and taxonomy of Siberian lemming. Inf. Pap. Inst. Plant Anim. Ecol., Sverdlovsk: 39?40 (Russian).