Optical spectroscopy of Eu3+ ion as a tool for the study of dehydration process in silica gels A. PIAZZA, A. BOUAJAJ, M. FERRARI, M. MONTAGNA, R. CAMPOSTRINI et G. CARTURANJ. Phys. IV France, 04 C4 (1994) C4-569-C4-572DOI: https://doi.org/10.1051/jp4:19944137