1. Einthoven W: The string galvanometer and measurement of the action currents of the heart. Nobel Lecture - Physiology or Medicine, 1965. pp. 94–112. Elsevier Publication.
2. Lewis T: Paroxysmal tachycardia; the result of ectopic impulse formation. Heart 1: 262, 1910.
3. Anderson RH, Becker AE, Tranum-Jensen J, Janse MJ: Anatomic electrophysiological correlations in the conduction system. Br. Heart J., 45: 67, 1981.
4. Wolff L, Parkinson J, White PD: Bundle branch block with short PR interval in healthy young people prone to paroxysmal tachycardia. Am. Heart J., 5: 685, 1930.
5. Wilson FN: A case in which the vagus influenced the form of the ventricular complex of the electrocardiogram. Arch. Int. Med. 16: 1008, 1915.