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Zhao, Changsheng; Xue, Jimin; Ran, Fen; Sun, Shudong . (2013). Modification of polyethersulfone membranes – A review of methods. Progress in Materials Science, 58(1), 76–150. doi:10.1016/j.pmatsci.2012.07.002 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research