@article{santos_couto_araújo_montenegro_reis_2004,  title={Determination of gibberellic acid by sequential injection analysis using a potentiometric detector based on Mn(III)-porphyrin with improved characteristics},  volume={15},  ISSN={0103-5053},  url={https://doi.org/10.1590/S0103-50532004000500015},  DOI={10.1590/S0103-50532004000500015},  number={5},  journal={Journal of the Brazilian Chemical Society},  publisher={Sociedade Brasileira de Química},  author={Santos, Emília M. G. and Couto, Cristina M. C. M. and Araújo, Alberto N. and Montenegro, M. Conceição B. S. M. and Reis, Boaventura F.},  year={2004},  month={Sep},  pages={701–707} }