Borowiec Jan, Thelin Stefan, Bagge Lars, van der Linden Jan, Thörnö Eva, and Hansson Hans-Erik. 1992. “Heparin-Coated Cardiopulmonary Bypass Circuits and 25% Reduction of Heparin Dose in Coronary Artery surgery—a Clinical Study”. Upsala Journal of Medical Sciences 97 (1):55-66. https://doi.org/10.3109/03009739209179282.