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Willy, W. Edward; McKean, Dennis R.; Garcia, Barbara A. . (1976). Conversion of Alkyl Chlorides to Bromides, Selective Reactions of Mixed Bromochloroalkanes, and Halogen Exchange. Bulletin of the Chemical Society of Japan, 49(7), 1989–1995. doi:10.1246/bcsj.49.1989 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research