@article{santos_pinto_1998,  title={Taking Variable Correlation into Consideration during Parameter Estimation},  volume={15},  ISSN={0104-6632},  url={https://doi.org/10.1590/S0104-66321998000100001},  DOI={10.1590/S0104-66321998000100001},  number={1},  journal={Brazilian Journal of Chemical Engineering},  publisher={Brazilian Society of Chemical Engineering},  author={Santos, T.J. and Pinto, J.C.},  year={1998},  month={Mar},  pages={1–20} }