DONIAS, H. W.; D’ANCONA, G.; PANDE, R. U.; SCHIMPF, D.; KAWAGUCHI, A. T.; KARAMANOUKIAN, H. L. Heparin Dose, Transfusion Rates, and Intraoperative Graft Patency in Minimally Invasive Direct Coronary Artery Bypass. The Heart Surgery Forum, v. 6, n. 3, p. 176-180, 7 Feb. 2005.