1. Sperelakis N: Electrical properties of embryonic heart cells. In: electrical phenomena of the heart. deMello WC (ed), New York and London, Academic Press, 1972, p 1–61.
2. Cranefield PF: The conduction of the cardiac impulse. The slow response and cardiac arrhythmias. Mount Kisco, New York, Futura, 1975.
3. Antoni H: Elektrophysiologische Studien zum Problem der Flimmerentstehung und Flim- merbeseitigung. Beitr. z. erst. Hilfe and Beh. v. Unf. d. elektr Strom 2: 1–18, 1961.
4. Gettes LS, Surawicz B, Shiue JCS: Effect of high K, low K, and quinidine on QRS duration and ventricular action potential. Amer J Physiol 203: 1135–1140, 1962.
5. Miiller P: Ca- and K-free solution and pacemaker activity in mammalian myocardium. Helv Physiol Acta 23: C38 - C41, 1965.