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Diede, Nathaniel T.; Bugg, Julie M. . (2017). Cognitive Effort Is Modulated Outside of the Explicit Awareness of Conflict Frequency: Evidence From Pupillometry.. Journal of Experimental Psychology: Learning, Memory, and Cognition, (), –. doi:10.1037/xlm0000349 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research