Havelin, Leif I, et al. “Early Failures Among 14,009 Cemented and 1,326 Uncemented Prostheses for Primary Coxarthrosis: The Norwegian Arthroplasty Register, 1987-1992”. Acta Orthopaedica, vol. 65, no. 1, Jan. 1994, pp. 1-6, doi:10.3109/17453679408993706.