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Bayer, Stefan; Steinheuser, Daniela; Grüner, Manfred; Keilig, Ludger; Enkling, Norbert; Stark, Helmut; Mues, Sebastian (2009). Comparative study of four retentive anchor systems for implant supported overdentures--retention force changes. Gerodontology, 26(4), pp. 268-72. Chichester: Wiley-Blackwell 10.1111/j.1741-2358.2009.00286.x
