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S.S. Tsai; A.Y. Sun; H.D. Kim; G.Y. Sun. (1993). Manganese exposure to PC-12 cells alters triacylglycerol metabolism and promotes neurite outgrowth. , 52(19), 1567–1575. doi:10.1016/0024-3205(93)90057-a 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research