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Dewey, K. G.; Nommsen-Rivers, L. A.; Heinig, M. J.; Cohen, R. J. . (2003). Risk Factors for Suboptimal Infant Breastfeeding Behavior, Delayed Onset of Lactation, and Excess Neonatal Weight Loss. PEDIATRICS, 112(3), 607–619. doi:10.1542/peds.112.3.607 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research