1. Lactation and cancer of the breast. A summary of an international study;MacMahon, B.; Lin, T.M.; Lowe, C.R.;Bull WHO,1970
2. An epidemiological study of oral contraceptives and breast cancer;Vessey, M.P.; Doll, R.; Jones, K.; McPherson, K.; Yeates, D.;Br Med J,1979
3. Statistical aspects of the analysis of data from retrospective studies of disease;Mantel, N.; Haenszel, W.;J Natl Cancer Inst,1959
4. Headache and other head pain;Wolff, H.G.