RT Journal Article SR Electronic T1 Non-invasive assessment of isolated atrial defects. JF British Heart Journal JO Heart FD BMJ Publishing Group Ltd and British Cardiovascular Society SP 163 OP 166 DO 10.1136/hrt.49.2.163 VO 49 IS 2 A1 Walker, J K A1 Jones, P R A1 Dighton, G P YR 1983 UL http://heart.bmj.com/content/49/2/163.abstract AB