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Levy, B. R.; Slade, M. D.; Gill, T. M. . (2006). Hearing Decline Predicted by Elders' Stereotypes. The Journals of Gerontology Series B: Psychological Sciences and Social Sciences, 61(2), P82–P87. doi:10.1093/geronb/61.2.p82 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research