SONG, J.; ZHI, G.; ZHANG, Y.; MEI, B. Synthesis and Characterization of CaF2 Nanoparticles with Different Doping Concentrations of Er3+. Nano-Micro Letters, [S. l.], v. 3, n. 2, p. 73-78, 2011. DOI: 10.1007/BF03353654. Disponível em: https://nmlett.org/index.php/nml/article/view/759. Acesso em: 2 may. 2024.