DOUNIS, E. Sacrococcygeal Agenesis: A Report of Four New Cases. Acta Orthopaedica, [S. l.], v. 49, n. 5, p. 475–480, 1978. DOI: 10.3109/17453677808993265. Disponível em: https://actaorthop.org/actao/article/view/29166. Acesso em: 28 may. 2026.