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2. Principles of Electricity;Page,1931
3. Principles of Electricity;Page,1931
4. Modern Electrocardiography, The P-Q-R-S-T-U Complex;Lepeschkin,1951
5. On the Direction and Manifest Size of the Variations of Potential in the Human Heart and on the Influence of the Position of the Heart on the Form of the Electrocardiogram;Einthoven;Am. Heart J.,1950