1. Practical Electrocardiography;Marriott,1980
2. Diagnostic Electrocardiography and Vectorcardiography;Friedman,1985
3. Principles of Clinical Electrocardiography;Goldman,1982
4. Electrocardiography: Practical Applications with Vectorial Approaches;Chung,1980
5. The ventricular complex in left ventricular hypertrophy as obtained by unipolar precordial and limb leads;Sokolow;Am Heart J,1949