Joshi, Parkash Chandra. “Comparative Study of Rock Mass Classification Systems: A Case Study of Nagdhunga-Naubisea Road Tunnel”. Himalayan Journal of Applied Science and Engineering 4, no. 2 (January 25, 2024): 1–10. Accessed May 19, 2024. https://nepjol.info/index.php/hijase/article/view/62183.