Joelson , Anders, et al. “Reoperations After Decompression With or Without Fusion for L4–5 Spinal Stenosis With or Without Degenerative Spondylolisthesis: A Study of 6,532 Patients in Swespine, the National Swedish Spine Register”. Acta Orthopaedica, vol. 92, no. 3, Jan. 2021, pp. 264–268, doi:10.1080/17453674.2021.1879505.