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Persaud, Bhagwant; Lyon, Craig; Nguyen, Thu . (1999). Empirical Bayes Procedure for Ranking Sites for Safety Investigation by Potential for Safety Improvement. Transportation Research Record: Journal of the Transportation Research Board, 1665(), 7–12. doi:10.3141/1665-02 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research