@article{ocampo-lópez_ramírez-carmona_vélez-ortiz_2013,  title={Thermodynamic analysis of stability in iron removal from kaolin by using oxalic acid},  volume={59},  ISSN={0366-6913},  url={https://doi.org/10.1590/S0366-69132013000200019},  DOI={10.1590/S0366-69132013000200019},  number={350},  journal={Cerâmica},  publisher={Associação Brasileira de Cerâmica},  author={Ocampo-López, C. and Ramírez-Carmona, M. E. and Vélez-Ortiz, E.},  year={2013},  month={Apr},  pages={326–330} }