Phong, N. X., Ngoc, N., Hoang, C. M., An, L. H. and Dang, H. N. (2016) “Biostratigraphy of Tri Ton carbonate formation, south of Song Hong basin”, Petrovietnam Journal, 70, pp. 40-47. Available at: http://www.pvj.com.vn/index.php/TCDK/article/view/531 (Accessed: 13January2026).