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Itoh, K.. (1985). Main Systolic Blood Flow Patterns in the Left and Right Ventricular Outflow Tracts Determined by Doppler Echocardiography. Angiology, 36(3), 143–153. doi:10.1177/000331978503600302 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research