1. Electrocardiography;Katz,1946
2. Ventricular tachycardia responding solely to digitalis therapy;Greenwood;Am. J. Cardiol.,1961
3. Anselmi, A., Rodríguez, M. I., and Sodi-Pallares, D.: Ventricular activation in ventricular extrasystole.
4. New bases of electrocardiography;Sodi-Pallares,1956
5. Different mechanism of fusion beats;Malinow;Am. Heart J.,1948