Borna, Z., S. Rahimi, S. Shahi, and V. Zand. “Mandibular Second Premolars With Three Root Canals: A Review and 3 Case Reports”. Iranian Endodontic Journal, vol. 6, no. 4, Sept. 2011, pp. 179-82, doi:10.22037/iej.v6i4.2518.