Capella, G [Use of echocardiography in the study of the Björk-Shiley disk valve prosthesis]. [electronic resource] - Bollettino della Societa italiana di cardiologia 1975 - 1779-83 p. digital Publication Type: Journal Article ISSN: 0037-878X Subjects--Topical Terms: Aortic ValveEchocardiographyHeart Valve Diseases--surgeryHeart Valve ProsthesisHumansMitral Valve