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Bayer, Stefan; Zuziak, Wiethold; Kraus, Dominik; Keilig, Ludger; Stark, Helmut; Enkling, Norbert (2011). Conical crowns with electroplated gold copings: retention force changes caused by wear and combined off-axial load. Clinical oral implants research, 22(3), pp. 323-9. Oxford: Wiley-Blackwell 10.1111/j.1600-0501.2010.02003.x
