Delman, A J <br/><br/>
Importance of proper selection and standardization of phonocardiographic equipment in the diagnosis of aortic ball variance.  [electronic resource] 

 -  The Annals of thoracic surgery  Jun 1971 
 - 607-9 p.  digital 
<br/><br/> Publication Type: Journal Article 
<br/><br/><label>ISSN: </label>0003-4975 
<br/><br/><label>Standard No.: </label>10.1016/s0003-4975(10)65083-7  doi 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Heart Valve Prosthesis<br/>Humans<br/>Phonocardiography--standards