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Tran, Ly Dieu; Popov, Ilya; Daugulis, Olafs . (2012). Copper-Promoted Sulfenylation of sp <sup>2</sup> C–H Bonds. Journal of the American Chemical Society, 134(44), 18237–18240. doi:10.1021/ja3092278 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research