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T. K. Peng, Mark F. Peterson and Yuh-Ping Shyi. (1991). Quantitative Methods in Cross-National Management Research: Trends and Equivalence Issues. Journal of Organizational Behavior, 12(2), 87–107. doi:10.2307/2488169 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research