HIEU, Nguyen; PHAI, Vu Van; HOWARD, Limbert. Cave systems in Phong Nha - Ke Bang area. VNU Journal of Science: Earth and Environmental Sciences, [S.l.], v. 28, n. 4, dec. 2012. ISSN 2588-1094. Available at: <https://js.vnu.edu.vn/EES/article/view/1555>. Date accessed: 27 dec. 2024.