@article{bakker_chumbimuni-torres_2008,  title={Modern directions for potentiometric sensors},  volume={19},  ISSN={0103-5053},  url={https://doi.org/10.1590/S0103-50532008000400003},  DOI={10.1590/S0103-50532008000400003},  number={4},  journal={Journal of the Brazilian Chemical Society},  publisher={Sociedade Brasileira de Química},  author={Bakker, Eric and Chumbimuni-Torres, Karin},  year={2008},  pages={621–629} }