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2. Effects of lactation on fertility;McNeilly;Br Med Bull,1979
3. Breast-feeding, Fertility, and Family Planning;McCann,1984
4. Preliminary observations on the return of ovarian function among breastfeeding and postpartum non-breastfeeding women in a rural area of Mexico;Rivera;J Biosoc Sci[Suppl],1985
5. Determinación simultanea de los niveles de excreción urinaria de hormona luteinizante, pregnandiol, pregnantriol, 17-hidroxicorticoides y 17-cetoesteroides durante el ciclo menstrual y sus implicaciones clínicas;Rivera;Ginecol Obstet Mex,1973