RT Journal Article SR Electronic T1 Congenital morphologies of the aortic valve JF Heart JO Heart FD BMJ Publishing Group Ltd and British Cardiovascular Society SP 592 OP 592 DO 10.1136/hrt.79.6.592 VO 79 IS 6 A1 ZUBER, M A1 JENNI, R YR 1998 UL http://heart.bmj.com/content/79/6/592.abstract AB