Cyvín, Karel Bjørn. “A Follow-up Study of Children With Instability of the Hip Joint at Birth: Clinical and Radiological Investigations With Special Reference to the Anteversion of the Femoral Neck”. Acta Orthopaedica 48, no. sup166 (April 1, 1977): 3–62. Accessed May 16, 2026. https://actaorthop.org/actao/article/view/29302.