@article{ferreira_girotto_2010,  title={pH effects on the ohmic properties of bromophenol blue-doped polypyrrole film},  volume={21},  ISSN={0103-5053},  url={https://doi.org/10.1590/S0103-50532010000200017},  DOI={10.1590/S0103-50532010000200017},  number={2},  journal={Journal of the Brazilian Chemical Society},  publisher={Sociedade Brasileira de Química},  author={Ferreira, Jacqueline and Girotto, Emerson M.},  year={2010},  pages={312–318} }