LAM, Doan Dinh.
 Morpho- structure characteristics of some karst caves  in Yen Mo- Tam Diep area, Ninh Binh province.
<strong>VNU Journal of Science: Earth and Environmental Sciences</strong>, [S.l.], v. 26, n. 3, sep. 2010.
ISSN 2588-1094.
Available at: &lt;<a href="https://js.vnu.edu.vn/EES/article/view/1784" target="_new">https://js.vnu.edu.vn/EES/article/view/1784</a>&gt;. Date accessed: 16 may 2024.