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Perrella, Mark A.; Margulies, Kenneth B.; Burnett Jr., John C. . (1991). Pathophysiology of congestive heart failure: role of atrial natriuretic factor and therapeutic implications. Canadian Journal of Physiology and Pharmacology, 69(10), 1576–1581. doi:10.1139/y91-234 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research