1. Agadjanian, A., 1976, Die Entwicklung der Lemminge der zentralen und östlichen Paläarktis im Pleistozän, Mitt. Bayer. Staatsamml. Paläontol. Hist. Geol
16: 53–64.
2. Avise, J. C., and Smith, M. H., 1977, Gene frequency comparisons between sunfish (Centrarchidae) populations at various stages of evolutionary divergence, Syst. Zool
26: 319–335.
3. Ayala, F. J., 1975, Genetic differentiation during the speciation process, Evol. Biol
8: 1–78.
4. Bourliere, F., 1951, Vie et moeurs des mammifères, Payot, Paris.
5. Carson, H. L., 1982, Speciation as a major reorganization of polygenic balances, in: Mechanisms of Speciation, pp. 411–433, A. R. Liss, New York.