1. Nor-gestrel, a low dose oral progestogen for fertility control: supplementary report;Roland;Obstet Gynecol,1968
2. Studies of “mini-micro” contraceptive doses of a new progestogen;Tyler;Int J Fértil,1968
3. Fertility control by continuous administration of d-norgestrel, 0.03mg;Kesserü;Int J Fertil,1972
4. Postcoital contraception with d-norgestrel;Kesserü;Contraception,1973
5. Evaluación del d-norgestrel como contraceptivo postcoital (abstr 56);Moggia,1974