Khademi, Abbasali, et al. “Root Morphology and Canal Configuration of First and Second Maxillary Molars in a Selected Iranian Population: A Cone-Beam Computed Tomography Evaluation”. Iranian Endodontic Journal, vol. 12, no. 3, July 2017, pp. 288-92, doi:10.22037/iej.v12i3.13708.