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Van de Velde, Tommie; Thevissen, Eric; Persson, G Rutger; Johansson, Carina; De Bruyn, Hugo (2009). Two-year outcome with Nobel Direct implants: a retrospective radiographic and microbiologic study in 10 patients. Clinical implant dentistry and related research, 11(3), pp. 183-93. Oxford: Blackwell 10.1111/j.1708-8208.2008.00112.x
