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Fukuda, Naohiro; Ikemoto, Tomomi . (2010). Imide-Catalyzed Oxidation System: Sulfides to Sulfoxides and Sulfones. The Journal of Organic Chemistry, 75(13), 4629–4631. doi:10.1021/jo100719w 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research