Havelin, L. I., Vollset, S. E. and Engesæter, L. B. (1995) “Revision for aseptic loosening of uncemented cups in 4,352 primary total hip prostheses: A report from the Norwegian Arthroplasty Register”, Acta Orthopaedica, 66(6), pp. 494–500. doi: 10.3109/17453679509002301.