@article{oliveira_lichtig_masini_2004,  title={Evaluation of a nafion coated glassy carbon electrode for determination of paraquat by differential pulse voltammetry},  volume={15},  ISSN={0103-5053},  url={https://doi.org/10.1590/S0103-50532004000500020},  DOI={10.1590/S0103-50532004000500020},  number={5},  journal={Journal of the Brazilian Chemical Society},  publisher={Sociedade Brasileira de Química},  author={Oliveira, Ulisses M. F. de and Lichtig, Jaim and Masini, Jorge C.},  year={2004},  month={Sep},  pages={735–741} }