LONG, N. V.; XUAN THAO, D. T.; CHIEN, N. D.; BINH, P. T. Structure and physico-chemical properties of silica gels doped with optically activated Er3+ ions by sol-gel process. Vietnam Journal of Chemistry, [S. l.], v. 45, n. 1, p. 114, 2014. DOI: 10.15625/4721. Disponível em: https://vjs.ac.vn/index.php/vjchem/article/view/4721. Acesso em: 5 may. 2024.