Rôkkum, Magne, and Astor Reigstad. “Polyethylene Wear With an Entirely HA-Coated Total Hip Replacement 79 Hips Followed for 5 Years”. Acta Orthopaedica, vol. 69, no. 3, Jan. 1998, pp. 253-8, doi:10.3109/17453679809000925.