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Steelman, L. A.; Levy, P. E.; Snell, A. F. . (2004). The Feedback Environment Scale: Construct Definition, Measurement, and Validation. Educational and Psychological Measurement, 64(1), 165–184. doi:10.1177/0013164403258440 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research