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Petersen, Isaac T.; Bates, John E.; Dodge, Kenneth A.; Lansford, Jennifer E.; Pettit, Gregory S. . (2015). Describing and predicting developmental profiles of externalizing problems from childhood to adulthood. Development and Psychopathology, 27(3), 791–818. doi:10.1017/S0954579414000789 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research