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Pierre Storck; Anne-Marie Aubertin; David S. Grierson. (2005). Tosylation/mesylation of 4-hydroxy-3-nitro-2-pyridinones as an activation step in the construction of dihydropyrido[3,4-b] benzo[f][1,4]thiazepin-1-one based anti-HIV agents. , 46(16), 2919–2922. doi:10.1016/j.tetlet.2005.02.128 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research