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Vermeulen, Lotte M.P.; De Smedt, Stefaan C.; Remaut, Katrien; Braeckmans, Kevin . (2018). The proton sponge hypothesis: Fable or fact?. European Journal of Pharmaceutics and Biopharmaceutics, 129(), 184–190. doi:10.1016/j.ejpb.2018.05.034 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research