1. Pharriss, B. B., Cornette, J. C., and Gutknecht, G. D., J. Reprod. Fert. (Suppl. 10) 97–103 (1970).
2. Behrman, H., Yoshinaga, K., and Greep, R. O., Ann. N.Y. Acad. Sci., 180, 426–435 (1971).
3. McCracken, J. A., Barcikowski, B., Carlson, J. C., Green, K., and Samuelsson, B., Adv. Biosci., 9, 599–624 (1973).
4. McCracken, J., Ann. N.Y. Acad. Sci., 180, 456–472 (1971).
5. Abdul-Karim, R. W., and Bruce, N. W., Fertil. Steril., 24, 44–47 (1973).