Comparison of exercise radionuclide angiography and 201thallium-myocardial perfusion imaging in coronary artery disease - Johnstone, D. E.; Sands, M. J.; Berger, H. J.; Reduto, L. A.; Lachmann, A. S.; Wackers, F. J. Th.; Cohen, L. S.; Gottschalk, A.; Zaret, B. L.; Pytlik, L. (Amer. J. Cardiol., 1980)