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H. Langsjoen; P. Langsjoen; P. Langsjoen; R. Willis; K. Folkers. (1994). Usefulness of Coenzyme Q10 in clinical cardiology: A long-term study. , 15(supp-S1), 0–. doi:10.1016/0098-2997(94)90026-4 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research