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Akira Miyake; Naomi P. Friedman; Michael J. Emerson; Alexander H. Witzki; Amy Howerter; Tor D. Wager. (2000). The Unity and Diversity of Executive Functions and Their Contributions to Complex “Frontal Lobe” Tasks: A Latent Variable Analysis. , 41(1), 49–100. doi:10.1006/cogp.1999.0734 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research