Acharya N, Paudel D, Chakradhar A. Incidence of Four Canals in Permanent Mandibular First Molar in Patients Attending Dhulikhel Hospital. J Coll Med Sci-Nepal [Internet]. 2018 Mar. 30 [cited 2024 Nov. 23];14(1):53-5. Available from: https://nepjol.info/index.php/JCMSN/article/view/18707