Hilgers, T. W., & Prebil, A. M. (1979). The ovulation method--vulvar observations as an index of fertility/infertility. Obstetrics and Gynecology, 53(1), 12-22.
Hilgers TW, Prebil AM. The ovulation method--vulvar observations as an index of fertility/infertility. Obstet Gynecol. 1979;53(1):12-22.
Hilgers, T. W., and A. M. Prebil. "The ovulation method--vulvar observations as an index of fertility/infertility." Obstetrics and Gynecology, vol. 53, no. 1, 1979, pp. 12-22.
The Billings Ovulation Method uses only cervical mucus to identify the fertile window. Learn how it works, what the evidence shows, and its value in restorative reproductive medicine.
