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Chih-Ming J Chen; Sylvan G Frank. (1983). Ultraviolet and nuclear magnetic resonance studies of the solubilization of chlorzoxazone by alkyltrimethylammonium halides. , 92(2), 396–402. doi:10.1016/0021-9797(83)90161-3 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research