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Moser, Kenneth M.; Rhodes, P. Gregg; Hufnagel, Charles C. . (1965). Chronic Unilateral Pulmonary-Artery Thrombosis. New England Journal of Medicine, 272(23), 1195–1199. doi:10.1056/NEJM196506102722302 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research