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V.I. Bukhtiyarov; A.I. Boronin; V.I. Savchenko. (1994). Stages in the Modification of a Silver Surface for Catalysis of the Partial Oxidation of Ethylene: I. Action of Oxygen. , 150(2), 262–267. doi:10.1006/jcat.1994.1344 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research