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Lindsley, William G.; Noti, John D.; Blachere, Francoise M.; Szalajda, Jonathan V.; Beezhold, Donald H. . (2014). Efficacy of Face Shields Against Cough Aerosol Droplets from a Cough Simulator. Journal of Occupational and Environmental Hygiene, 11(8), 509–518. doi:10.1080/15459624.2013.877591 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research