@article{silva_vasconcelos_1999,  title={Influence of processing variables on the pore structure of silica gels obtained with tetraethylorthosilicate},  volume={2},  ISSN={1516-1439},  url={https://doi.org/10.1590/S1516-14391999000300014},  DOI={10.1590/S1516-14391999000300014},  number={3},  journal={Materials Research},  publisher={ABM, ABC, ABPol},  author={Silva, Rúbia F. and Vasconcelos, Wander L.},  year={1999},  month={Jul},  pages={197–200} }