1. Baldi, F. (Sacramento Surgery Center), Fields, G., Stewart, G., and Michelson, H.: Personal communication.
2. Ectopic pregnancy: A 16 year survey of 905 cases;Bobrow;Am. J. Obstet. Gynecol,1962
3. A 21 year survey of 654 ectopic pregnancies;Breen;Am. J. Obstet. Gynecol,1970
4. Vaginal versus abdominal tubal ligation;Akhter;Am. J. Obstet. Gynecol,1973
5. An evaluation of tubal ligations in Switzerland;Barglon;Am. J. Obstet. Gynecol,1966