1. The T wave of the electrocardiogram during and after exercise in normal subjects;Kitchin, A.H.; Neilson, J.M.;Cardiovascular Research; The electrocardiogram after standard exercise as a functional test of the heart,1972
2. Criteria for the clinical application of the 'two-step' exercise test: observation of false-negative and false-positive responses;Master, A. M.; Rosenfeld, I. 1961;Journal of the American Medical Association
3. Schaefer, H., and Haas, H. G. 1962. Electrocardiography. In Handbook of Physiology, section 2, vol. I, pp. 387 and 389. Ed. by W. E. Hamilton and P. Dow. American Physiological Society, Washington, D.C.