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Luszczynska, Aleksandra; Scholz, Urte; Schwarzer, Ralf . (2005). The General Self-Efficacy Scale: Multicultural Validation Studies. The Journal of Psychology, 139(5), 439–457. doi:10.3200/JRLP.139.5.439-457 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research