Wallander, Henrik, et al. “Correction of Persistent Clubfoot Deformities With the Llizarov External Fixator Experience in 10 Previously Operated Feet Followed for 2–5 Years”. Acta Orthopaedica, vol. 67, no. 3, Jan. 1996, pp. 283-7, doi:10.3109/17453679608994690.