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Sivasailam, Barathi; Manski, Scott; Wentz, Alicia; Cross, Raymond K. . (2019). Presence of Obstructive Symptoms and Absence of Perianal Crohnʼs Disease Is Predictive of Surgery After Endoscopic Balloon Dilation. American Journal of Gastroenterology, 114(Supplement), S473–S474. doi:10.14309/01.ajg.0000592820.59957.15 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research