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Lemhöfer, Kristin; Broersma, Mirjam . (2012). Introducing LexTALE: A quick and valid Lexical Test for Advanced Learners of English. Behavior Research Methods, 44(2), 325–343. doi:10.3758/s13428-011-0146-0 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research