1. Selected aspects of the contraceptive practices of unmarried university students;Bauman;Am J Obstet Gynecol,1970
2. The use of estrogen as a post-coital contraceptive in North Carolina---trick or treatment;Crist;NC Med J,1973
3. Morning-after-pill: die post-koitale hormonelle Schwangerschaftsverhutung (morning-after-pill: the postcoital hormonal protection against pregnancy);Doring;Deutsches Arzteblatt,1971
4. Echeverry , G Sarria , C Dosis altas de d-norgestrel como anti conceptivo post-coital (high doses of d-norgestrel as postcoital contraceptive) 5 1974
5. Oral contraceptives and congenital limb-reduction defects;Janerick;N Engl J Med,1974