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Loureiro, S.; Schnitman, A.; Barreto, M. . (1990). Environmental Perception and Schistosomiasis: A Study of Rural Children in Brazil. Environment and Behavior, 22(2), 272–279. doi:10.1177/0013916590222005 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research