References
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- Gold R. G. Portable Electrocardiographs—a trial of fourteen models. Part 2: electronic considerations. World Medical Electronics 1967; 5: 292
- Hampton J. The selection of an ECG recorder. Equipment Supplement, British Journal of Hospital Medicine 1973; 9: 34
- Report of Committee on Electrocardiography American Heart Association. Circulation 1967; 35: 583