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Neel, Cari Gillen-O'; Fuligni, Andrew . (2013). A Longitudinal Study of School Belonging and Academic Motivation Across High School. Child Development, 84(2), 678–692. doi:10.1111/j.1467-8624.2012.01862.x 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research