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Chambers, Richard D.; Sandford, Graham; Trmcic, Jelena; Okazoe, Takashi. (2008). Elemental Fluorine. Part 21. (1) Direct Fluorination of Benzaldehyde Derivatives. , 12(2), 339–344. doi:10.1021/op700194r 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research