@article{abreu_van raij_abreu_gonzález_2005,  title={Routine soil testing to monitor heavy metals and boron},  volume={62},  ISSN={0103-9016},  url={https://doi.org/10.1590/S0103-90162005000600009},  DOI={10.1590/S0103-90162005000600009},  number={6},  journal={Scientia Agricola},  publisher={Escola Superior de Agricultura "Luiz de Queiroz"},  author={Abreu, Cleide Aparecida de and van Raij, Bernardo and Abreu, Mônica Ferreira de and González, Antonio Paz},  year={2005},  month={Nov},  pages={564–571} }