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Tofighi, Davood; MacKinnon, David P. . (2015). Monte Carlo Confidence Intervals for Complex Functions of Indirect Effects. Structural Equation Modeling: A Multidisciplinary Journal, (), 1–12. doi:10.1080/10705511.2015.1057284 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research