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Mills, J. F.; Kroner, D. G.; Forth, A. E. . (2002). Measures of Criminal Attitudes and Associates (MCAA): Development, Factor Structure, Reliability, and Validity. Assessment, 9(3), 240–253. doi:10.1177/1073191102009003003 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research