1. Anbinder EM (1980) The karyology and evolution of pinnipeds. Akademia Nauk, USSR (in Russian)
2. Ámason Ú (1970) The karyotype of the grey seal (Halichoerus grypus). Hereditas 64:237?242
3. Ámason Ú (1972) The role of chromosomal rearrangement in mammalian speciation with special reference to Cetacea and Pinnipedia. Hereditas 70:113?118
4. Ámason Ú (1974) Comparative chromosome studies in Pinnipedia. Hereditas 76:179?226
5. Ámason Ú (1977) The relationship between the four principal pinniped karyotypes. Hereditas 87:227?242