@ARTICLE {5081,
author={ Vicente and M.R. Ferreira and E. Pecoraro and P.S André and L. Carlos},
doi={10.1007/s10971-010-2254-1},
journal={Journal of Sol Gel Science and Technology},
title={Optical filters and resonant cavities based on di-ureasil},
year={2010},
month={June},
volume={10},
number={1007},
pages={475-479},
ISSN={0928-0707}
}