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Puth, Marie-Therese; Neuhäuser, Markus; Ruxton, Graeme D. . (2015). Effective use of Spearman's and Kendall's correlation coefficients for association between two measured traits. Animal Behaviour, 102(), 77–84. doi:10.1016/j.anbehav.2015.01.010 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research