HUONG, L. T. T.; HAEGER, T.; PHAN, T.-L. Study of impurity in blue spinel from the Luc Yen mining area, Yen Bai province, Vietnam. Vietnam Journal of Earth Sciences, [S. l.], v. 40, n. 1, p. 47–55, 2018. DOI: 10.15625/0866-7187/40/1/10915. Disponível em: https://vjs.ac.vn/index.php/jse/article/view/10915. Acesso em: 17 oct. 2021.