Lindequist, Stig, Bengt Malmqvist, and Gösta Ullmark. “Fixation of Femoral Neck Fracture: Prospective Comparison of Von Bahr Screws, Gouffon Screws, and Hessel Pins”. Acta Orthopaedica 60, no. 3 (January 1, 1989): 293–298. Accessed April 22, 2026. https://actaorthop.org/actao/article/view/22580.