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Boyode, B. P.; Sinet, M.; Farese, A.; Forestier-Roux, M.- A.; Condom, R.; Ayi, I. A.; Kirn, A.; Moog, C.; Guedj, R. . (1995). Synthesis and Antiviral Evaluation of Fluorinated Dipyridodiazepinones and Dipyridodiazepines (Nevirapine Derivatives). Antiviral Chemistry and Chemotherapy, 6(3), 162–168. doi:10.1177/095632029500600305 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research