Management of thromboembolism after aortic valve replacement with the Bjork-Shiley tilting disc valve. Medicamental prevention with dicumarol in comparison with dipyridamole-acetylsali-cylic acid, surgical treatment of prosthetic thrombolism - Björk, V; Henz, A (Scand. J. Thorac. Cardiovasc. Surg, 1975)