@article{zaitseva_gushikem_2002,  title={Antimony (V) Oxide Adsorbed on a Silica-Zirconia Mixed Oxide Obtained by the Sol-Gel Processing Method: Preparation and Acid Properties},  volume={13},  ISSN={0103-5053},  url={https://doi.org/10.1590/S0103-50532002000500011},  DOI={10.1590/S0103-50532002000500011},  number={5},  journal={Journal of the Brazilian Chemical Society},  publisher={Sociedade Brasileira de Química},  author={Zaitseva, Galina and Gushikem, Yoshitaka},  year={2002},  month={Sep},  pages={611–617} }