1. Liley, A. W., in Pathophysiology of Gestation, II (edit. by Assali, N. S., and Brinkman, C. R.), 154–182 (Academic, New York and London, 1972).
2. Vizsolyi, E., and Perks, A. M., Can. J. Zool., 52, 371–386 (1974).
3. Friesen, H., et al., in Prolactin and Carcinogenesis (edit. by Boyns, A. R., and Griffiths, K.), 64–80 (Alpha Omega Alpha Publishing Co., Cardiff, 1972).
4. Josimovich, J. B., Weiss, G., and Hutchinson, D. L. Endocrinology, 94, 1364–1371 (1974).
5. Lockett, M. F., J. Physiol., Lond., 181, 192–199 (1965).