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Dr Jihao Zhou, Ying Yuan, Rebecca Reynolds, Susan Raber, Youjuan Li. (2006). Cost-Efficient Higher-Order Crossover Designs in Comparative Bioavailability Studies. , 45(6), 623–632. doi:10.2165/00003088-200645060-00005 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research