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Dryzer, Scott R.; Allen, Mary Lynn; Strange, Charlie; Sahn, Steven A. . (1993). A Comparison of Rotation and Nonrotation in Tetracycline Pleurodesis. Chest, 104(6), 1763–1766. doi:10.1378/chest.104.6.1763 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research