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Stashenko, P.; Teles, R.; D'Souza, R. . (1998). Periapical Inflammatory Responses and Their Modulation. Critical Reviews in Oral Biology & Medicine, 9(4), 498–521. doi:10.1177/10454411980090040701 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research