1. National survey of exercise stress testing;Stewart;Chest,1980
2. Exercise testing and training of apparently healthy individuals: A handbook for physicians,1972
3. Stress testing: Principles and practice;Ellestad,1975
4. Exercise testing of patients with coronary heart disease;Bruce;Ann Clin Res,1971
5. An experimental study of physical fitness of air force personnel;Balke;US Armed Forces Med J,1959