Coronary angioscopy in patients with unstable angina pectoris - Sherman, CT; Litvack, F; Grundfest, W; Lee, M; Hickey, A; Chaux, A; Kass, R; Blanche, C; Matloff, J; Morgenstern, L; Ganz, W; Swan, HJC; Forrester, J (N Engl J Med, 1986)