Phong, N. X., Ngoc, N., Hoang, C. M., An, L. H., & Dang, H. N. (2016). Biostratigraphy of Tri Ton carbonate formation, south of Song Hong basin. Petrovietnam Journal, 7, 40-47. Retrieved from http://www.pvj.com.vn/index.php/TCDK/article/view/531