Dang P, Bui V. Determination of Air Leakage of Auxiliary Ventilation Ducting Sys- tem in VANG DANH Underground Mine. L-E [Internet]. 2022Apr.13 [cited 2024Dec.22];10(6):179-80. Available from: https://ojs.piscomed.com/index.php/L-E/article/view/2857