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Gregori, Elena; Torras, Eulalia; Guasch, Teresa . (2012).
Cognitive attainment in online learning environments: matching cognitive and technological presence. Interactive Learning Environments, 20(5), 467–483.
doi:10.1080/10494820.2010.531026
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research