References

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1. Efficacy of a new Method of Family Planning: Standard Days Method
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4. Spieler JM. Collins WP. Potential fertility-defining the window of opportunity. J Intl Med Res 2001; 29 (Suppl.1): 3A-13A.
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6. United Nations. Levels and Trends of Contraceptive Use as Assessed in 1998. United Nations Report ESA/P/WP.155 New York, 1999.
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10. World Health Organization (WHO). A prospective multicentre trial of the ovulation method of natural family planning. I. The teaching phase. Fertil Steril 1981: 36: 152-8.
11. World Health Organization (WHO). A prospective multicentre trial of the ovulation method of natural family planning. II. The effectiveness phase. Fert Ster 1981: 36: 591-8.