1. Watson, J., Anderson, F.B., Alam, M., O’Grady, J.E. and Heald, P.J. (1975). Plasma hormones and pituitary luteinizing hormone in the rat during the early stages of pregnancy and after post-coital treatment tamoxifen (ICI 46,474). J. EndocrinoL, 65, 7–17.
2. Shaikh, A.A. and Abraham, G.E. (1969). Measurement of estrogen surge during pseudopregnancy in rats by radioimmunoassay. Biol. Reprod., 1, 378–80.
3. Gerber, G.B., Jacquet, P., Leonard, A. and Maes, J. (1979). Evaluation des taux d’oestradiol, de progesterone et de prostaglandines E et F2α durant le gestation chez la Souris. C.R. Soc. Biol., 173, 644–59.
4. Bhatt, B.M. and Bullock, D.W. (1974). Binding of oestradiol to rabbit blastocysts and its possible role in implantation. J. Reprod. Fertil., 39, 65–70.
5. Dey, S. K., Dickman, Z. and Sen Gupta, J. (1976). Evidence that the maintenance of early pregnancy in the rabbit requires ‘blastocyst estrogen’. Steroids, 28, 481–5.