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Thomsen, Henrik S; Svendsen, Ove; Klastrup, Signe. (2004). Increased manganese concentration in the liver after oral intake1. , 11(1), 38–44. doi:10.1016/S1076-6332(03)00571-3 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research