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Jacobs, C.; Sari, R. . (1986). Clinical Evaluation of a Flat Plate Dialyzer Equipped with a Polycarbonate Polyether Copolymer Membrane. Blood Purification, 4(1-3), 32–39. doi:10.1159/000169424 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research