Acharya, Nisha, Durga Paudel, and Anil Chakradhar. “Incidence of Four Canals in Permanent Mandibular First Molar in Patients Attending Dhulikhel Hospital”. Journal of College of Medical Sciences-Nepal 14, no. 1 (March 30, 2018): 53–55. Accessed April 26, 2024. https://www.nepjol.info/index.php/JCMSN/article/view/18707.