MJORUD, J. A randomized study in all cervical hip fractures. Osteosynthesis with Hansson hook-pins versus AO-screws in 199 consecutive patients followed for two years. Injury. 2006, 37, 8, 768-777
LYKKE, N. Fixation of fractures of the femoral neck. A prospective, randomized trial of three Ulleveal hip screws versus two Hansson hook-pins. J Bone Joint Surg Br. 2003, 85, 3, 426-430