RT Journal Article SR Electronic T1 Electronic Cardiac Pacemaker After Open-Heart Operations JF Cleveland Clinic Journal of Medicine JO Cleve Clin J Med FD Cleveland Clinic SP 84 OP 91 VO 25 IS 2 A1 Olmsted, Frederick A1 Kolff, Willem J. A1 Effler, Donald B. YR 1958 UL http://www.ccjm.org/content/25/2/84.abstract AB