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Engelsen, J.; Nielsen, J.D.; Winther, K. . (2002). Effect of Coenzyme Q10 and Ginkgo biloba on Warfarin Dosage in Stable, Long-term Warfarin Treated Outpatients. A Randomised, Double Blind, Placebo-crossover Trial. Thrombosis and Haemostasis, 87(6), 1075–1076. doi:10.1055/s-0037-1613135 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research