@article{saab_martin-neto_2003,  title={Use of the EPR technique to determine thermal stability of some humified organic substances found in soil organic-mineral fractions},  volume={26},  ISSN={0100-4042},  url={https://doi.org/10.1590/S0100-40422003000400010},  DOI={10.1590/S0100-40422003000400010},  number={4},  journal={Química Nova},  publisher={Sociedade Brasileira de Química},  author={Saab, Sérgio da Costa and Martin-Neto, Ladislau},  year={2003},  month={Jul},  pages={497–498} }