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BURSTOW, DARRYL J.; OH, JAE K.; BAILEY, KENT R.; SEWARD, JAMES B.; TAJIK, A. JAMIL . (1989). Cardiac Tamponade: Characteristic Doppler Observations. Mayo Clinic Proceedings, 64(3), 312–324. doi:10.1016/S0025-6196(12)65251-3 

An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research