@article{charbel_massarani_passos_1999,  title={Analysis of effective solid stresses in a conical spouted bed},  volume={16},  ISSN={0104-6632},  url={https://doi.org/10.1590/S0104-66321999000400011},  DOI={10.1590/S0104-66321999000400011},  number={4},  journal={Brazilian Journal of Chemical Engineering},  publisher={Brazilian Society of Chemical Engineering},  author={CHARBEL, A. L. T. and MASSARANI, G. and PASSOS, M. L.},  year={1999},  month={Dec} }