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Chen, Chen; Su, Jianhua; Tong, Xiaofeng . (2013). Rhodium-Catalyzed Carbocyclization and Chlorosulfonylation of 1,6-Enynes with Sulfonyl Chlorides. Chemistry - A European Journal, 19(16), 5014–5018. doi:10.1002/chem.201204039 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research