1. K.J. Ryan and R.V. Short, Endocrinology76, 108 (1965).
2. C.P. Channing, in: The Gonads, p. 245. Ed. K.W. McKerns. Appleton, New York 1969.
3. D.T. Armstrong, in: Ovarian follicular development and function, p. 223. Ed. A.R. Midgley and W.A. Sadler. Raven Press, New York 1979.
4. N. Hassaan, Thesis, Vet. med. Univ. Wien 1979.