J. Ghoddusi, M. Forghani, A. Bagherpour, F. Mahmudabadi, and M. Sarmad, “Residual Dentin Thickness of Bifurcated Maxillary Premolars Following Two Post Space Preparation Methods”, Iran Endod J, vol. 8, no. 3, pp. 94–98, Jul. 2013.