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BERGER, BONNIE G.; OWEN, DAVID R. . (1992). MOOD ALTERATION WITH YOGA AND SWIMMING-AEROBIC EXERCISE MAY NOT BE NECESSARY. Perceptual and Motor Skills, 75(3f), 1331–1343. doi:10.2466/pms.1992.75.3f.1331 

An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research