@article{walker_2004,  title={The food spectrum of the cardinal - tetra (Paracheirodon axelrodi, Characidae) in its natural habitat},  volume={34},  ISSN={0044-5967},  url={https://doi.org/10.1590/S0044-59672004000100009},  DOI={10.1590/S0044-59672004000100009},  number={1},  journal={Acta Amazonica},  publisher={Instituto Nacional de Pesquisas da Amazônia},  author={Walker, Ilse},  year={2004},  pages={69–73} }