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Wilmar B. Schaufeli; Marisa Salanova; Vicente González-romá; Arnold B. Bakker. (2002). The Measurement of Engagement and Burnout: A Two Sample Confirmatory Factor Analytic Approach. , 3(1), 71–92. doi:10.1023/a:1015630930326 

An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research