1. La Régulation des naissances;Baillargeon,1963
2. A prospective field trial of the Ovulation Method of avoiding conception;Ball;Journal de Gynrcologie, Obstetrique et Biologie de la Reproduction,1976
3. Effectiveness of the temperature rhythm system of contraception;Bartzen;Fertility and Sterility,1967
4. Sexual cycle, time of ovulation and time of optimum fertility in women;Bergman;Acta Obstetrica et Gynecologica Scandinavica,1950
5. The idea of the ovulation method;Billings;Australian Family Physician,1973