Recombinant hirudin as a new anticoagulant during cardiac operations instead of heparin: Successful for aortic valve replacement in man. - Riess,F.C.; Löwer,C.; Seelig,C.; Bleese,N.; Kormann,J.; Müller-Berghaus,G.; Pötzsch,B. (J Thorac Cardiovasc Surg, 1995)