Geburtshilfe Und Frauenheilkunde, 42(1), 66-69
During the last decade, the World Health Organization has paid increasing attention to some reliable methods of birth control based on periodic abstinence. There are 2 main methods of natural family planning--the Sympto-Thermal method and the Billings Ovulation method. The latter is explained in this paper. Its scientific basis, use, effectiveness, and importance as a birth control method as well as for understanding certain types of infertility are discussed. (author's)
Meier-Vismara, E., & Meier-Vismara, U. (1982). [Natural family planning: ovulation method after Billings (author's transl)]. *Geburtshilfe und Frauenheilkunde*, *42*(1), 66-69. https://doi.org/10.1055/s-2008-1036626
Meier-Vismara E, Meier-Vismara U. [Natural family planning: ovulation method after Billings (author's transl)]. Geburtshilfe Frauenheilkd. 1982;42(1):66-69. doi:10.1055/s-2008-1036626
Meier-Vismara, Elisabetta, and U. Meier-Vismara. "[Natural family planning: ovulation method after Billings (author's transl)]." *Geburtshilfe und Frauenheilkunde*, vol. 42, no. 1, 1982, pp. 66-69.