H. O. Fredin, S. A. Nillius, and D. Bergqvist, “Prophylaxis of Deep Vein Thrombosis in Patients with Fracture of the Femoral Neck: A Prospective Comparison between Dextran and a Sulphated Polysaccharide”, ActaO, vol. 53, no. 3, pp. 413–417, Jan. 1982.