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M.D. Aceto; I. Botton; M. Levitt; R. Martin; H.C. Bentley; P.T. Speight. (1970). Pharmacologic properties and mechanism of action of amfonelic acid. , 10(3), 344–354. doi:10.1016/0014-2999(70)90206-2 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research