Vestad, Einar, and Bjørn Næs. “Spondylolisthesis: Treatment by Excision of the Loose Lamina and Resection of the Pedicle”. Acta Orthopaedica 48, no. 5 (January 1, 1977): 472–478. Accessed April 28, 2026. https://actaorthop.org/actao/article/view/29279.