VERMA, R.S.; JOSHI, G.K. Study of Energy Parameters of Some Er(III) Doped Systems. Asian Journal of Chemistry, [S. l.], v. 13, n. 4, p. 1530–1534, 2010. Disponível em: https://asianpubs.org/index.php/ajchem/article/view/22836. Acesso em: 5 nov. 2024.