1. Compounds interfering with ovum implantation and development. III. The role of estrogens;Morris;Am. J. Obstet. Gynecol.,1966
2. Interception. Postcoital estrogens in 3,016 women;Haspels;Contraception,1976
3. Post coital contraception: a pilot study;Yuzpe;J. Reprod. Med.,1974
4. Postcoital contraception with DL-norgestrel;Kesseru;Contraception,1973
5. Postcoital copper IUDs;Lippes;Adv. Plan. Parent.,1979