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Bornstein, Michael M; Wasmer, Joelle; Sendi, Pedram; Janner, Simone F M; Buser, Daniel; von Arx, Thomas (2012). Characteristics and dimensions of the Schneiderian membrane and apical bone in maxillary molars referred for apical surgery: a comparative radiographic analysis using limited cone beam computed tomography. Journal of endodontics, 38(1), pp. 51-7. Hagerstown, Md.: Elsevier 10.1016/j.joen.2011.09.023
