RT Journal Article SR Electronic T1 Discrete subvalvar aortic stenosis after tetralogy of Fallot repair. JF British Heart Journal JO Heart FD BMJ Publishing Group Ltd and British Cardiovascular Society SP 510 OP 512 DO 10.1136/hrt.49.5.510 VO 49 IS 5 A1 C Christy A1 J A Noonan A1 W N O'Connor YR 1983 UL http://heart.bmj.com/content/49/5/510.abstract AB