RT Journal Article SR Electronic T1 AURICULAR PREMATURE SYSTOLES: THE DURATION OF THE ELECTRICAL SYSTOLE JF British Heart Journal JO Heart FD BMJ Publishing Group Ltd and British Cardiovascular Society SP 69 OP 75 DO 10.1136/hrt.8.2.69 VO 8 IS 2 A1 Kurt Berliner YR 1946 UL http://heart.bmj.com/content/8/2/69.abstract AB