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Moreno-Arza, I.; Ochoa, D.; Román, M.; Cabaleiro, T.; Abad-Santos, F. . (2015). Utility of Pilot Studies for Prediction of Bioequivalence Ratio and Intrasubject Variability. Clinical Therapeutics, 37(8), e149–. doi:10.1016/j.clinthera.2015.05.426 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research