Gharti, A., N. Joshi, K. Prajapati, S. D. Wagle, and . S. Shrestha. “Extra Canal in Permanent Maxillary First Molar in Patients Undergoing Root Canal Treatment at a Tertiary Care Dental Hospital, Nepal”. Journal of Kathmandu Medical College, vol. 10, no. 1, Aug. 2021, https://jkmc.com.np/ojs3/index.php/journal/article/view/1087.