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Dr. A. D. Dunn; Dr. R. Norrie. (1993). The reaction of some Halogenated Pyridine Thioethers and sulphones with carbon disulphide. , 335(3), 269–272. doi:10.1002/prac.19933350309 

An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research