Aspirin, heparin, or both to treat acute unstable angina. - Théroux, P; Ouimet, H; McCans, J; Latour, J-G; Joly, P; Lévy, G; Pelletier, E; Juneau, M; Stasiak, J; de Guise, P; Pelletier, GB; Rinzler, D; Waters, DD (N Engl J Med, 1988)