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Stephan Arndt; Carolyn Turvey; Nancy C. Andreasen. (1999). Correlating and predicting psychiatric symptom ratings: Spearmans r versus Kendalls tau correlation. , 33(2), 97–104. doi:10.1016/s0022-3956(98)90046-2 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research