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Ma, Jie; Jiang, Heng; Gong, Hong; Sun, Zhaolin . (2006). Esterification of Chloroacetic Acid with Alcohols Catalyzed by Zinc Methanesulfonate. Petroleum Science and Technology, 24(5), 431–440. doi:10.1081/lft-200043689 

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