HOI, P. V.; HUY, B.; CHI, D. T. Effect of Excitation Migration and Upconversion in Highly Erbium-doped Glass Micro-sphere Lasers. Communications in Physics, [S. l.], v. 20, n. 2, p. 143, 2012. DOI: 10.15625/0868-3166/20/2/2168. Disponível em: https://vjs.ac.vn/index.php/cip/article/view/2168. Acesso em: 19 apr. 2024.