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Colgan, Sean P.; Curtis, Valerie F.; Campbell, Eric L. . (2013). The Inflammatory Tissue Microenvironment in IBD. Inflammatory Bowel Diseases, 19(10), 2238–2244. doi:10.1097/mib.0b013e31828dcaaf 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research