Dalaei Moghadam, Maryam, and Forough Farahi. “Endodontic Treatment of Bilateral Mandibular First Premolars With Three Root Canals: A Report of Two Cases”. Iranian Endodontic Journal, vol. 16, no. 4, Oct. 2021, pp. 261-4, doi:10.22037/iej.v16i4.34781.