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Koch, PP; Tannast, M; Fujita, H; Siebenrock, KA; Ganz, R (2008). Minimum ten year results of total hip arthroplasty with the acetabular reinforcement ring in avascular osteonecrosis. International orthopaedics, 32(2), pp. 173-9. Heidelberg: Springer-Verlag 10.1007/s00264-006-0303-8
