1. Ashchepkov, A.T. and Kuzin, A.E., Mixing, Time, and Routes of Migration of Northern Fur Seals from Different Herds in Pacific Waters of Japan, Biol. Morya, 1986, no. 6, pp. 26–32.
2. Ashchepkov, A.T. and Kuzin, A.E., Age and Sex Composition of Northern Fur Seal Herds in Pacific Waters of Japan, Biol. Morya, 1987, no. 2, pp. 29–38.
3. Ashchepkov, A.T. and Kuzin, A.E., Abundance and Age-Sex Composition of Different Northern Fur Seal Populations on Shared Wintering Grounds, Izv. TINRO, 1990, vol. 112, pp. 11–21.
4. Bogdanov, L.V. and Chernoivanov, V.A., Population Studies of Electrophoretic Types of Transferrins and Peroxidases of Northern Fur Seal Pups, Morskie mlekopitayushchie, Tezisy dokladov VII Vsesoyuznogo soveshchniya (Marine Mammals, Abstracts of Papers, VII All-Union Symposium), Moscow, 1978, p. 44.
5. Bogdanov, L.V., Chernoivanov, V.A., Polyakovsky, V.I., and Bashurova, T.I., Biochemical Polymorphism of the Northern Fur Seal Callorhinus ursinus from Three Areas of the Northwestern Pacific Ocean, Genetika, 1977, vol. 13, no. 6, pp. 1008–1014.