Dang, Phuongthao, and Vanduyen Bui. “Determination of Air Leakage of Auxiliary Ventilation Ducting Sys- Tem in VANG DANH Underground Mine”. Learning & Education 10, no. 6 (April 13, 2022): 179-180. Accessed December 22, 2024. https://ojs.piscomed.com/index.php/L-E/article/view/2857.