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Mnih, Volodymyr; Kavukcuoglu, Koray; Silver, David; Rusu, Andrei A.; Veness, Joel; Bellemare, Marc G.; Graves, Alex; Riedmiller, Martin; Fidjeland, Andreas K.; Ostrovski, Georg; Petersen, Stig; Beattie, Charles; Sadik, Amir; Antonoglou, Ioannis; King, Helen; Kumaran, Dharshan; Wierstra, Daan; Legg, Shane; Hassabis, Demis . (2015). Human-level control through deep reinforcement learning. Nature, 518(7540), 529–533. doi:10.1038/nature14236 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research