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Nappo, Solange A.; Galduróz, José F. Carlos; Noto, Ana R. . (1996). Crack Use in Sa¯o Paulo. Substance Use & Misuse, 31(5), 565–579. doi:10.3109/10826089609045827 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research