REFERENCES
- Bumpass L, Westoff CF: The perfect contraceptive population: Extent and implications of unwanted fertility in the United States. Science 169:1177, 1970
- Pion RJ, Wabreck AJ, Wilson WB: Innovative methods in the prevention of the need for abortion. In Holtzman G (Editor): Clinical Obstetrics and Gynecology. New York, Medical Department, Harper & Row, Publishers, Inc, 1971
- Pion RJ: Pregnancy detection and community outreach. Obstet Gynecol 34:300, 1969