RT Journal Article SR Electronic T1 Artificial aortic valves tested by simultaneous recording of aortic and ventricular pressures JF Cleveland Clinic Journal of Medicine JO Cleve Clin J Med FD Cleveland Clinic SP 67 OP 74 VO 34 IS 1 A1 Klain, Miroslav A1 Leitz, Knut H. YR 1967 UL http://www.ccjm.org/content/34/1/67.abstract AB