1. Implantable pacemaker for the heart;Elmquist,1960
2. A transistorized self-contained implantable pacemaker for the long term correction of complete heart block;Chardack;Surgery,1960
3. Five years' clinical experience with an implanted pacemaker: an appraisal;Chardack;Surgery,1965
4. Permanent endocardial pacing in complete heart block;Harthorne;Ann. Intern. Med.,1967
5. Permanently implanted transvenous pacemakers;McHenry;Circulation,1968