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HAVLICEK, LARRY L.; PETERSON, NANCY L. . (1976). ROBUSTNESS OF THE PEARSON CORRELATION AGAINST VIOLATIONS OF ASSUMPTIONS. Perceptual and Motor Skills, 43(3f), 1319–1334. doi:10.2466/pms.1976.43.3f.1319 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research