NACHEMSON, Alf L. Evaluation of results in lumbar spine surgery. Acta Orthopaedica, [S. l.], v. 64, n. sup251, p. 130–133, 1993. DOI: 10.3109/17453679309160143. Disponível em: https://actaorthop.org/actao/article/view/21914. Acesso em: 19 jun. 2026.