TY - JOUR A1 - Adair, L.S. A1 - Popkin, B.M. A1 - Guilkey, D.K. T1 - The duration of breast-feeding: How is it affected by biological, sociodemographic, health sector, and food industry factors? Y1 - 1993 DO - 10.2307/2061863 JF - Demography VL - 30 IS - 1 ER -