@ARTICLE {5813,
author={C. Vicente and R. A. Sá Ferreira and E. Pecoraro and P.S André and L. D. 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 organic–inorganic hybrids},
year={2011},
month={August},
volume={59},
number={3},
pages={475-479},
ISSN={0928-0707}
}