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Watanabe, Yuko. (2008). Peer–Peer Interaction between L2 Learners of Different Proficiency Levels: Their Interactions and Reflections. Canadian Modern Language Review, 64(4), 605–635. doi:10.3138/cmlr.64.4.605 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research