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Low, Kenneth M T; Dula, Karl; Bürgin, Walter Bruno; von Arx, Thomas (2008). Comparison of periapical radiography and limited cone-beam tomography in posterior maxillary teeth referred for apical surgery. Journal of endodontics, 34(5), pp. 557-562. Hagerstown, Md.: Elsevier 10.1016/j.joen.2008.02.022
