1. Karpechenko, G. D., Z. Indukt. Abstamm.- u. Vererbungsl., 48, 1 (1928).
2. Müntzing, A., Hereditas, 16, 105 (1932).
3. McFadden, E. S., and Sears, E. R., J. Hered., 37, 81, 107 (1946).
4. Mayr, E., Animal Species and Evolution (Belknap, Cambridge, 1963).
5. Dobzhansky, Th., Genetics of the Evolutionary Process (Columbia University Press, New York and London, 1970).