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Schroeder, Kenneth W.; Tremaine, William J.; Ilstrup, Duane M. . (1987). Coated Oral 5-Aminosalicylic Acid Therapy for Mildly to Moderately Active Ulcerative Colitis. New England Journal of Medicine, 317(26), 1625–1629. doi:10.1056/NEJM198712243172603 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research