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Obiorah, I.; Hussain, A.; Palese, C.; Azumi, N.; Benjamin, S.; Ozdemirli, M. . (2017). IgG4-related disease involving the esophagus: a clinicopathological study. Diseases of the Esophagus, 30(12), 1–7. doi:10.1093/dote/dox091 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research