@article{biaggio_bocchi_rocha-filho_varela_1997,  title={Electrochemical characterization of thin passive films on Nb electrodes in H3PO4 solutions},  volume={8},  ISSN={0103-5053},  url={https://doi.org/10.1590/S0103-50531997000600008},  DOI={10.1590/S0103-50531997000600008},  number={6},  journal={Journal of the Brazilian Chemical Society},  publisher={Sociedade Brasileira de Química},  author={Biaggio, Sonia R. and Bocchi, Nerilso and Rocha-Filho, Romeu C. and Varela, Francisco E.},  year={1997},  pages={615–620} }