B. A. Swierstra, F. J. van Oosterhout, B. Ausema, W. H. Bakker, W. B. van der Pompe, and H. J. A. Schouten, “Oral anticoagulants and dextran for prevention of venous thrombosis in orthopaedics”, ActaO, vol. 55, no. 3, pp. 251–253, Jan. 1984.