1. Beatty, R. A., Parthenogenesis and Polyploidy in Mammalian Development (Cambridge University Press, 1957); Austin, C. R., The Mammalian Egg (Blackwell's Scientific Publications, Oxford, 1961).
2. Haldane, J. B. S., in Animal Cytology and Evolution (by White, M. J. D.), 283 (Cambridge University Press, 1945).
3. Graham, C. F., Symp. Wistar Inst., No. 9, 19 (1969).
4. Runner, M. N., and Palm, J., J. Exp. Zool., 124, 303 (1953).
5. Whitten, W. K., and Biggers, J. D., J. Reprod. Fert., 17, 399 (1968).