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Dovidio, J. F.; Eller, A.; Hewstone, M. . (2011). Improving intergroup relations through direct, extended and other forms of indirect contact. Group Processes & Intergroup Relations, 14(2), 147–160. doi:10.1177/1368430210390555 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research