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Penner., Louis A.; Dovidio., John F.; Piliavin., Jane A.; Schroeder., David A. . (2005). Prosocial Behavior: Multilevel Perspectives. Annual Review of Psychology, 56(1), 365–392. doi:10.1146/annurev.psych.56.091103.070141 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research