G. J. Palmer, I. S. Sankaran, G. M. Sparkman, A. Koster, C. M. Dyke, and G. Ebra, “Routine Use of the Direct Thrombin Inhibitor Bivalirudin for Off-Pump Coronary Artery Bypass Grafting is Safe and Effective”, HSF, vol. 11, no. 1, pp. E24-E29, Feb. 2008.