RT Journal Article SR Electronic T1 THE CONDUCTING SYSTEM OF THE VERTEBRATE HEART JF British Heart Journal JO Heart FD BMJ Publishing Group Ltd and British Cardiovascular Society SP 66 OP 76 DO 10.1136/hrt.4.3.66 VO 4 IS 3 A1 Francis Davies YR 1942 UL http://heart.bmj.com/content/4/3/66.abstract AB