Coronary-artery spasm immediately after myocardial revascularization: recognition and management.
Buxton AE, Goldberg S, Harken A, Hirshfield J, Kastor JA. Coronary-artery spasm immediately after myocardial revascularization: recognition and management. N Engl J Med. 1981 May 21; 304(21):1249-53.