@article{articled0063a35,
title   = {Upconversion in 'Nd POT.3 +' doped glasses: microscopic theory and spectroscopic measurements},
author = {Oliveira, S. L. and Sousa, D. F. and Andrade, Acácio Aparecido and Nunes, Luiz Antônio de Oliveira and Catunda, Tomaz},
year = {2008},
doi = {10.1063/1.2826908},
journal   = {Journal of Applied Physics}
}