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Mensink, P. B. F.; Moons, L. M. G.; Kuipers, E. J. . (2011). Chronic gastrointestinal ischaemia: shifting paradigms. Gut, 60(5), 722–737. doi:10.1136/gut.2009.199695 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research