1. Cheatham, J. E., Medtronic Inc., Minneapolis, Minn., February and June, 1971, Personal communication.
2. Duehren, W., General Electric Co., Milwaukee, Wisc., February and June, 1971, Personal communication.
3. Electronic analyses for pacemaker failure;Furman;Ann. Thorac. Surg.,1969
4. Method of testing implanted pacemakers;Knuckey;Br. Heart J.,1965
5. Measurement of pacemaker performance;Preston;Am. Heart J.,1966