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Vandenberg, R. J.; Lance, C. E. . (2000). A Review and Synthesis of the Measurement Invariance Literature: Suggestions, Practices, and Recommendations for Organizational Research. Organizational Research Methods, 3(1), 4–70. doi:10.1177/109442810031002 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research