TY - CHAP A1 - McNeilly, A.S. T1 - Breastfeeding and fertility Y1 - 1993 A3 - Gray, R.H. A3 - Leridon, H. A3 - Spira, A. T2 - Biomedical and demographic determinants of reproduction CY - Oxford PB - Clarendon Press SP - 391 EP - -412 ER -