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Del Buono, Marco Giuseppe; Arena, Ross; Borlaug, Barry A.; Carbone, Salvatore; Canada, Justin M.; Kirkman, Danielle L.; Garten, Ryan; Rodriguez-Miguelez, Paula; Guazzi, Marco; Lavie, Carl J.; Abbate, Antonio . (2019). Exercise Intolerance in Patients With Heart Failure. Journal of the American College of Cardiology, 73(17), 2209–2225. doi:10.1016/j.jacc.2019.01.072 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research