1. Post-coital contraception—a pilot study;Yuzpe;J Reprod Med,1974
2. Ethinyl estradiol and dl-norgestrel as a postcoital contraceptive;Yuzpe;Fertil Steril,1977
3. The use of ethinyl estradiol and norgestrel pills as a morning after contraceptive;Grillo;Bulletin of the Department of Gynecology and Obstetrics and Affiliated Institutions of the Woodruff Medical Center,1980
4. An alternative to the use of high-dose estrogens for postcoital contraception;Schilling;J Am Coll Health Assoc,1979
5. Post-coital contraception using dl-norgestrel/ethinyl estradiol combination;Smith;Contraception,1978