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4. Breast-feeding, fertility and family planning;McCann, M.F.; Liskin, L.S.; Piotrow, P.T.; Rinehart, W.; Fox, G.;Popul Rep (J),1981
5. Breastfeeding patterns and duration of lactational amenorrhea in urban Chilean women;Diaz, S.; Rodriguez, G.; Marshall, F.; del Pino, G.; Casado, M.E.; Miranda, P.; Schiappa Casse, V.; Croxiafo, H.B.;Contraception,1988