Fredin, H. O., S. A. Nillius, and D. Bergqvist. 1982. “Prophylaxis of Deep Vein Thrombosis in Patients With Fracture of the Femoral Neck: A Prospective Comparison Between Dextran and a Sulphated Polysaccharide”. Acta Orthopaedica 53 (3):413-17. https://doi.org/10.3109/17453678208992235.