RT Journal Article SR Electronic T1 Vectorcardiographic T loop analysis in ischaemic heart disease. JF British Heart Journal JO Heart FD BMJ Publishing Group Ltd and British Cardiovascular Society SP 917 OP 921 DO 10.1136/hrt.33.6.917 VO 33 IS 6 A1 W Gray A1 H H Bell YR 1971 UL http://heart.bmj.com/content/33/6/917.abstract AB