Tan, Mai Thanh, Vu Thi Minh Nguyet, Hoang Van Tha, Bui Van Thom, La The Phuc, & Luong Thi Tuat. " Paleokarst in Phong Nha - Ke Bang - Hin Nam No and its Geomorphological and Geological Values." VNU Journal of Science: Earth and Environmental Sciences [Online], 40.3 (2024): n. pag. Web. 4 Dec. 2024