@article{mellis_cruz_casagrande_2004,  title={Nickel adsorption by soils in relation to pH, organic matter, and iron oxides},  volume={61},  ISSN={0103-9016},  url={https://doi.org/10.1590/S0103-90162004000200011},  DOI={10.1590/S0103-90162004000200011},  number={2},  journal={Scientia Agricola},  publisher={Escola Superior de Agricultura "Luiz de Queiroz"},  author={Mellis, Estêvão Vicari and Cruz, Mara Cristina Pessôa da and Casagrande, José Carlos},  year={2004},  month={Mar},  pages={190–195} }