1. Royal College of General Practitioners’ Oral Contraceptive Study. Further analysis of mortality in oral contraceptive users. Lancet, 1, 541–546 (1981)
2. Fertility in older women;JANSEN;IPPF Medical Bulletin,1984
3. Contraception for the older woman;GUILLEBAUD;Journal of Obstetrics and Gynaecology,1985
4. Maternal mortality in women aged 35 years or older: United States;BUEHLER;Journal of the American Medical Association,1986
5. Office of Population Censuses and Surveys (OPCS). Statistics for Fertility and Mortality 1981 and 1982. HMSO, London (1984)