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Dr J. A. García-Rodriguez,A. del Cañizo,J. E. García Sanchez…. (1993). Efficacy of 2 Regimens of Local Ciprofloxacin in the Treatment of Ear Infections. Drugs, 45(3 Supplement), 327–328. doi:10.2165/00003495-199300453-00126 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research