RT Journal Article SR Electronic T1 Balloon dilatation of the aortic valve in adults: a surgeon's view. JF British Heart Journal JO Heart FD BMJ Publishing Group Ltd and British Cardiovascular Society SP 205 OP 206 DO 10.1136/hrt.63.4.205 VO 63 IS 4 A1 T Treasure YR 1990 UL http://heart.bmj.com/content/63/4/205.abstract AB