RT Journal Article SR Electronic T1 THE MECHANISM OF THE PULSUS BISFERIENS JF British Heart Journal JO Heart FD BMJ Publishing Group Ltd and British Cardiovascular Society SP 519 OP 524 DO 10.1136/hrt.19.4.519 VO 19 IS 4 A1 Peter R. Fleming YR 1957 UL http://heart.bmj.com/content/19/4/519.abstract AB