Effects of clopidogrel in addition to aspirin in patients with acute coronary syndromes without ST-segment elevation - Yusuf, S; Zhao, F; Mehta, SR; Chrolavicius, S; Tognoni, G; Fox, KK (N Engl J Med, 2001)
; Clopidogrel in Unstable Angina to Prevent Recurrent Events Trial Investigators.