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De Clercq, Barbara; De Fruyt, Filip; De Bolle, Marleen; Van Hiel, Alain; Markon, Kristian E.; Krueger, Robert F. . (2014). The Hierarchical Structure and Construct Validity of the PID-5 Trait Measure in Adolescence. Journal of Personality, 82(2), 158–169. doi:10.1111/jopy.12042 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research