THANH, Đỗ Vân; 						NHUẬN, Mai Trọng.
 Bauxit trong hang động Karst vùng mỏ Tapna - Cao Bằng.
<strong>VNU Journal of Science: Natural Sciences and Technology</strong>, [S.l.], v. 9, n. 7, sep. 1993.
ISSN 2588-1140.
Available at: &lt;<a href="https://js.vnu.edu.vn/NST/article/view/4402" target="_new">https://js.vnu.edu.vn/NST/article/view/4402</a>&gt;. Date accessed: 05 may 2024.