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Zhang, Hongjian; Cui, Donghui; Wang, Bonnie; Han, Yong-Hae; Balimane, Praveen; Yang, Zheng; Sinz, Michael; Rodrigues, A David . (2007). Pharmacokinetic Drug Interactions Involving 17α-Ethinylestradiol. Clinical Pharmacokinetics, 46(2), 133–157. doi:10.2165/00003088-200746020-00003 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research