Chakradhar, A., M. Nepal, S. Pradhan, N. Acharya, and P. Poudel. “Occurrence of Extra Roots in Permanent Mandibular Molars: A Cone Beam Computed Topography Study”. Journal of Nepalese Society of Periodontology and Oral Implantology, vol. 5, no. 1, July 2021, pp. 29-33, doi:10.3126/jnspoi.v5i1.38180.