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von Arx, T; Steiner, R Gemmet; Tay, F R (2011). Apical surgery: endoscopic findings at the resection level of 168 consecutively treated roots. International endodontic journal, 44(4), pp. 290-302. Chichester: Wiley-Blackwell 10.1111/j.1365-2591.2010.01811.x