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Halina M. Ratajczak; Tadeusz Lis; Grzegorz Rusek. (1994). The crystal and molecular structure of (dibenzo-18-crown-6) oxonium tetrachloroferrate(III). , 327(2-3), 241–246. doi:10.1016/0022-2860(93)08161-v 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research