Olsson, Sven S., et al. “Total Hip Replacement by the Muller-Charnley Prosthesis: A Follow-up Study of 238 Operations After 2 to 7 Years”. Acta Orthopaedica, vol. 50, no. 4, Jan. 1979, pp. 457-63, doi:10.3109/17453677908989790.