P. Kulka

Fibrinolytic activity and bleeding after cardiac surgery with cardiopulmonary bypass and low-dose aprotinin therapy

G. Dangas, F. Kuepper, A. Wiebalck, 2003, Blood coagulation & fibrinolysis : an international journal in haemostasis and thrombosis.

Efficacy and safety of tramadol and morphine in patients with extremely severe postoperative pain

M. Tryba, A. Wiebalck, M. Zenz, 2000 .