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Davis, R. N.; Davis, M. M.; Freed, G. L.; Clark, S. J. . (2011). Fathers' Depression Related to Positive and Negative Parenting Behaviors With 1-Year-Old Children. PEDIATRICS, 127(4), 612–618. doi:10.1542/peds.2010-1779 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research