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García, B; Peñarrocha, M; Peñarrocha, M A; Von Arx, T (2010). Apical surgery of a maxillary molar creating a maxillary sinus window using ultrasonics: a clinical case. International endodontic journal, 43(11), pp. 1054-61. Chichester: Wiley-Blackwell 10.1111/j.1365-2591.2010.01776.x
