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J. Kříẑ; J. Punčochářová; L. Vodička; J. Vařeka. (1988). High-performance liquid chromatography of alkylbenzenes on alumina. , 437(none), 177–183. doi:10.1016/s0021-9673(00)90380-7 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research