1. Contraceptive failure in the United States: an update;Trussell;Stud Fam Plan,1990
2. Opportunities and choices;Cooper,1992
3. D. Ahlburg, I. Diamond, Family planning programmes In: D. Ahlburg, et al. (Eds), Population and development, Spnnger, New York ((in press)).
4. Efficiency of three variations of periodic abstinence for family planning in Indonesia;Thapa;Stud Fam Plan,1990
5. Demographic study on the family planning behaviour of the German population: the importance of natural methods;Freundl;Int J Fertil,1988