@article{marchi_vilar_o’connor_silva_2015,  title={Surface Complexation Modeling in Variable Charge Soils: Charge Characterization by Potentiometric Titration},  volume={39},  ISSN={0100-0683},  url={https://doi.org/10.1590/01000683rbcs20140528},  DOI={10.1590/01000683rbcs20140528},  number={5},  journal={Revista Brasileira de Ciência do Solo},  publisher={Sociedade Brasileira de Ciência do Solo},  author={Marchi, Giuliano and Vilar, Cesar Crispim and O’Connor, George and Silva, Marx Leandro Naves},  year={2015},  month={Sep},  pages={1387–1394} }