1. Prognostic value of exercise electrocardiogram in older men;Åstrand;Scand J Clin Lab Invest,1969
2. The Minnesota Code for ECG classification. Adaptation to CR leads and modification of the code for ECGs recorded during and after exercise;Åstrand;Acta Med Scand,1967
3. Aerobic work capacity in middle-aged Norwegian men;Andersen;J Appl Physiol,1965
4. Cardiovascular adaptation to prolonged physical effort;Beckner;Circulation,1954