Delaunay, Christian P, and Adalbert I Kapandji. “Survivorship of Rough-Surfaced Threaded Acetabular Cups 382: Consecutive Primary Zweymiiller Cups Followed for 0.2–12 Years”. Acta Orthopaedica, vol. 69, no. 4, Jan. 1998, pp. 379-83, doi:10.3109/17453679808999050.