RT Journal Article SR Electronic T1 Early detection of silent ischaemic heart disease by 24-hour electrocardiographic monitoring of active subjects. JF British Heart Journal JO Heart FD BMJ Publishing Group Ltd and British Cardiovascular Society SP 481 OP 486 DO 10.1136/hrt.36.5.481 VO 36 IS 5 A1 S Stern A1 D Tzivoni YR 1974 UL http://heart.bmj.com/content/36/5/481.abstract AB