Diem, Cong Huy. “Studying a Solution for Improving the Working Effectiveness of Transferring Altitudes via Vertical Shafts to Tunnels When Building Big-Depth Tunnels”. Journal of Geodesy and Cartography, no. 30 (December 1, 2016): 50–54. Accessed November 14, 2026. https://jgac.vn/index.php/journal/article/view/201.