1. Single administration of hormones for long-term control of reproductive function;Segal,1967
2. Contraception with subdermal implants containing gestagens. Plasma levels of d-norgestrel and megestrol acetate and effects on the ovarian steroid pattern;Weiner,1976
3. One-year contraception with norgestrienone subdermal silastic implants;Coutinho;Fertil Steril,1974
4. Eighteen months contraception following subdermal insertion of silastic capsules containing norgestrienone;Da Silva;Int J Fertil,1978
5. Long-acting contraceptive implants. An analysis of menstrual bleeding patterns;Faundes;Contraception,1978