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Hyun Jin Choi; So Yeon Lee; Yuri Cho; Haja No; Seong Who Kim; Onyou Hwang. (2006). Tetrahydrobiopterin causes mitochondrial dysfunction in dopaminergic cells: Implications for Parkinson's disease. , 48(4), 0–262. doi:10.1016/j.neuint.2005.10.011 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research