Phúc, La, 		Tuất, Lương, 		Hải, Trương, AND 		Ngọc, Nguyễn.
" Caves in Basalts in Krông Nô Area, Đắk Nông Province, Vietnam" <em>VNU Journal of Science: Earth and Environmental Sciences</em> [Online], Volume 31 Number 2 (15 June 2015)