Papillary Fibroelastoma of Aortic and Mitral Valves Following Myectomy for Idiopathic Hypertrophic Subaortic Stenosis - Levinsky, L; Srinivasan, V; Gingell, R L; Fisher, J E; Pieroni, D R; Choh, J H; Subramanian, S (The Thoracic and Cardiovascular Surgeon, 1981)