1. Baird, D.D., Weinberg, C.R., Wilcox, A.J. et al. (1991) Using the ratio of urinary oestrogen and progesterone metabolites to estimate day of ovulation. Stat. Med., 10, 255–266.
2. Barrett, J. C. and Marshall, J. (1969) The risk of conception on different days of the menstrual cycle. Pop. Studies, 23, 455–461.
3. Bongaarts, J. (1983) The proximate determinants of natural marital fertility. In Bulatao, R.A., Lee, R.D., Hollerbach, P.E. and Bongaarts, J. (eds), Determinants of Fertility in Developing Countries. Vol. 1. Academic Press, New York, USA, pp. 103–138.
4. Collins, W.P., Branch, C.M., Collins, P.O. and Sallam, H.M. (1983) Biochemical indices of the fertile period in women. Int. J. Fertil., 26, 196.
5. Dunson, D.B. and Weinberg, C.R. (1999a) Modeling human fertility in the presence of measurement error. Biometrics, in press.