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Tanaka-Matsumi, Junko; Kameoka, Velma A. . (1986). Reliabilities and concurrent validities of popular self-report measures of depression, anxiety, and social desirability.. Journal of Consulting and Clinical Psychology, 54(3), 328–333. doi:10.1037/0022-006x.54.3.328 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research