Nadezhda, Syrbu, Luong Le Duc, Kholmogorov Andre, and Hoang Nguyen. “Formation of Anomalous Gas Fields of Helium and Hydrogen in the Cat Ba, Co To and Bach Long Vi Islands, Northern Vietnam”. Vietnam Journal of Earth Sciences 43, no. 3 (June 22, 2021): 301–315. Accessed March 28, 2024. https://vjs.ac.vn/index.php/jse/article/view/16197.