@article{gushikem_rosatto_2001,  title={Metal Oxide Thin Films Grafted on Silica Gel Surfaces: Recent Advances on the Analytical Application of these Materials},  volume={12},  ISSN={0103-5053},  url={https://doi.org/10.1590/S0103-50532001000600002},  DOI={10.1590/S0103-50532001000600002},  number={6},  journal={Journal of the Brazilian Chemical Society},  publisher={Sociedade Brasileira de Química},  author={Gushikem, Yoshitaka and Rosatto, Simone S.},  year={2001},  month={Nov},  pages={695–705} }