hellstadius, Arvid. “A Contribution to the Question of the Origin of Anterior Paradiscal Defects and So-Called Persisting Apophyses in the Vertebral Bodies”. Acta Orthopaedica 18, no. 1-4 (January 1, 1949): 377–386. Accessed May 28, 2026. https://actaorthop.org/actao/article/view/31086.