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Laden, Francine; Schwartz, Joel; Speizer, Frank E.; Dockery, Douglas W. . (2006). Reduction in Fine Particulate Air Pollution and Mortality. American Journal of Respiratory and Critical Care Medicine, 173(6), 667–672. doi:10.1164/rccm.200503-443oc 

An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research