Akhlaghi, Nahid Mohammadzadeh, et al. “Root Canal Anatomy and Morphology of Mandibular First Molars in a Selected Iranian Population: An In Vitro Study”. Iranian Endodontic Journal, vol. 12, no. 1, Dec. 2016, pp. 87-91, doi:10.22037/iej.v12i1.13599.