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Vossen, Helen G.M.; Valkenburg, Patti M. . (2016). Do social media foster or curtail adolescents’ empathy? A longitudinal study. Computers in Human Behavior, 63(), 118–124. doi:10.1016/j.chb.2016.05.040 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research