1. Oral Contraceptives. Population Report,1974
2. M. Smith, E.M. Backett, D. Baird, R.W. Beard, P.M.F. Bishop, J.E. Bottomley, S. Clayton, et al., Br. med. J. ((in the press)).
3. Oral Contraceptives and Health: an interim report from the Oral Contraceptive Study of the Royal College of General Practitioners,1974