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GRAHAM, NEIL M. H.. (1990). THE EPIDEMIOLOGY OF ACUTE RESPIRATORY INFECTIONS IN CHILDREN AND ADULTS: A GLOBAL PERSPECTIVE. Epidemiologic Reviews, 12(1), 149–178. doi:10.1093/oxfordjournals.epirev.a036050 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research