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Bache, R. J.; Vrobel, T. R.; Ring, W. S.; Emery, R. W.; Andersen, R. W. . (1981). Regional myocardial blood flow during exercise in dogs with chronic left ventricular hypertrophy. Circulation Research, 48(1), 76–87. doi:10.1161/01.RES.48.1.76 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research