@article{articlecd174041, title = {'Er POT. 3+' doped phosphoniobate glasses and planar waveguides: structural and optical properties}, author = {Barbosa, A. J. and Dias Filho, F. A. and Maia, L. J. Q. and Messaddeq, Younnes and Ribeiro, S. J. L. and Gonçalves, Rogéria Rocha}, year = {2008}, doi = {10.1088/0953-8984/20/28/285224}, journal = {Journal of Physics Condensed Matter} }