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R. B. Raffa; J. V. Pergolizzi Jr. (2012). The evolving understanding of the analgesic mechanism of action of flupirtine. , 37(1), 4–6. doi:10.1111/j.1365-2710.2010.01233.x 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research