@article{matsuo_val_2002,  title={Low pH and calcium effects on net Na+ and K+ fluxes in two catfish species from the Amazon River (Corydoras: Callichthyidae)},  volume={35},  ISSN={0100-879X},  url={https://doi.org/10.1590/S0100-879X2002000300012},  DOI={10.1590/S0100-879X2002000300012},  number={3},  journal={Brazilian Journal of Medical and Biological Research},  publisher={Associação Brasileira de Divulgação Científica},  author={Matsuo, A.Y. and Val, A.L.},  year={2002},  month={Mar},  pages={361–367} }