Cyvín, Karel Bjørn. 1977. “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 (sup166):3-62. https://doi.org/10.3109/ort.1977.48.suppl-166.01.