Cuong DV, Thanh TV, Anh TN. Study on the possibility of using artificial pillar to replace the protection coal pillar of the preparation roadways during the mining process at underground coal mines in Quang Ninh region, Vietnam. IM [Internet]. 13 styczeń 2022 [cytowane 19 kwiecień 2024];2(2). Dostępne na: https://inzynieriamineralna.com.pl/index.php/testowe/article/view/312