RT Journal Article SR Electronic T1 New contrast agents and technologies for myocardial contrast echocardiography JF Heart JO Heart FD BMJ Publishing Group Ltd and British Cardiovascular Society SP 7 OP 11 DO 10.1136/hrt.78.Suppl_1.7 VO 78 IS Suppl 1 A1 Daniele Rovai A1 Mark J Monaghan YR 1997 UL http://heart.bmj.com/content/78/Suppl_1/7.abstract AB