LANGELAND, Norvald; ROAAS, Asbjørn. Spondylitis Psoriatica. Acta Orthopaedica, [S. l.], v. 42, n. 5, p. 391–396, 1971. DOI: 10.3109/17453677108989060. Disponível em: https://actaorthop.org/actao/article/view/29893. Acesso em: 8 may. 2026.