@article{article3c3df9c6,
title   = {Preparation and characterization of erbium and ytterbium co-doped sol-gel Si'O IND.2':Hf'O IND.2' films for planar waveguides},
author = {Sigoli, Fernando A. and Gonçalves, Rogéria Rocha and de Camargo, Andrea Simone Stucchi and Nunes, Luiz Antônio de Oliveira and Messaddeq, Younnes and Ribeiro, Sidney J. L.},
year = {2007},
journal   = {Optical Materials}
}