1. Long acting methods of contraception
2. Hormonal implants: Contraception for a new century
3. Contraception with two levonorgestrel rod implants
4. Segal, S. J., and Croxatto, H. B., 1967. 1967, Single administration of hormones for long-term control of reproductive function. Paper presented at the 23rd Meeting of the American Fertility Society, Washington, D.C.
5. Segal, S. J., and Mishell, D. R. 1982. Advances in Fertility Research. New York: Raven; 1982. pp. 117–127.