1. Fertility and infertility statistics;Cooke;Clinics Obstet.Gynaecol.,1981
2. Fertility after stopping different methods of contraception;Vessey;Brit.Med.J.,1978
3. Infertility: etiology and natural history;Belsey,1980
4. The natural history and major causes of infertility;Cooke,1977
5. Epidemiological methods for study of long-term effects of birth control methods;Vessey,1981