WIIG, Ola. Perthes’ disease in Norway. Acta Orthopaedica, [S. l.], v. 80, n. sup333, p. 1–44, 2009. DOI: 10.1080/17453690610046594. Disponível em: https://actaorthop.org/actao/article/view/18850. Acesso em: 25 apr. 2026.