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McDowell, Claude; Acklin, Marvin W. . (1996). Standardizing Procedures for Calculating Rorschach Interrater Reliability: Conceptual and Empirical Foundations. Journal of Personality Assessment, 66(2), 308–320. doi:10.1207/s15327752jpa6602_9 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research