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2. Clinical Electrocardiography;Scherf,1953
3. “The Atrial Electrocardiogram in Mitral Stenosis,”;Reynolds;Brit. Heart J.,1953
4. “A Method for the Electrocardiographic Recognition of Atrial Enlargement,”;Macruz;Circulation,1958
5. Modern Electrocardiography: The P-Q-R-S-T-U Complex;Lepeschkin,1951