1. Normal Duration of Electrocardiographic Ventricular Complex;Adams;J. Clin. Investigation,1936
2. Normal Duration of the Q-T Interval;Ashman,1939
3. Normal Duration of the Q-T Interval;Ashman;Am. Heart J.,1942
4. Essentials of Electrocardiography;Ashman,1938
5. An Analysis of the Time Relationship of the Electrocardiogram;Bazett;Heart,1920