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2. Results of two years of exercise training in middle-aged men;Palone;The Physician and Sports-medicine,1976
3. Natural history of male psychological health;Valliant;Arch Gen Psychiatry,1976
4. Psychological fitness as a function of physical fitness;Folkins;Arch Phys Med Rehabil,1972
5. Effect of increase in physical fitness on mental ability following physical and mental stress;Gutin;Res Q,1966