Soini, Juhani R, and Seppo K Seitsalo. “The External Fixation Test of the Lumbar Spine: 30 Complications in 25 of 100 Consecutive Patients”. Acta Orthopaedica, vol. 64, no. 2, Jan. 1993, pp. 147-9, doi:10.3109/17453679308994556.