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3. Prospective randomised study of coronary artery bypass surgery in stable angina pectoris;European Coronary Surgery Study Group.;Lancet,1980
4. Left main coronary artery disease is surgery always indicated?;Battock;Am J Cardiol,1974
5. Left main coronary artery lesions. Risks of catheterization; exercise testing and surgery;Khaja;Circulation,1974