PHO, N. V.; XUAN, P. T.; DANG, P. T. Occurrence of supergene nickel ores in the Ha Tri Massive, Hoa An District, Cao Bang Province. Vietnam Journal of Earth Sciences, [S. l.], v. 40, n. 2, p. 153–164, 2018. DOI: 10.15625/0866-7187/40/2/11676. Disponível em: https://vjs.ac.vn/index.php/jse/article/view/11676. Acesso em: 29 mar. 2024.