1. Presented to the Eighth Annual Meeting of the American Association of Planned Parenthood Physicians;Davis,1970
2. The Shield Intrauterine Device, A Superior Modern Contraceptive;Davis;Am. J. Obstet. & Gynec.,1970
3. Intrauterine Contraception: Recommended Procedures for Data Analysis;Tietze;Studies in Family Planning,1967
4. Tietze, C.: Personal Communication.