@article{leite_souza_galembeck_2001,  title={Core-and-shell nature of Stöber silica particles},  volume={12},  ISSN={0103-5053},  url={https://doi.org/10.1590/S0103-50532001000400013},  DOI={10.1590/S0103-50532001000400013},  number={4},  journal={Journal of the Brazilian Chemical Society},  publisher={Sociedade Brasileira de Química},  author={Leite, Carlos A. P. and Souza, Elizabeth F. de and Galembeck, Fernando},  year={2001},  month={Jul},  pages={519–525} }