hellstadius, A. 1949. A Contribution to the Question of the Origin of Anterior Paradiscal Defects and So-Called Persisting Apophyses in the Vertebral Bodies. Acta Orthopaedica. 18, 1-4 (Jan. 1949), 377–386. DOI:https://doi.org/10.3109/17453674908988983.