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Gracis, Stefano; Michalakis, Konstantinos; Vigolo, Paolo; Vult von Steyern, Per; Zwahlen, Marcel; Sailer, Irena (2012). Internal vs. external connections for abutments/reconstructions: a systematic review. Clinical oral implants research, 23 Suppl 6, pp. 202-216. Oxford: Wiley-Blackwell 10.1111/j.1600-0501.2012.02556.x
