@article{marques_oliveira_machado_2003,  title={Limnological study of Piraquara river (Upper Iguaçu basin): spatiotemporal variation of physical and chemical variables and watershed zoning},  volume={46},  ISSN={1516-8913},  url={https://doi.org/10.1590/S1516-89132003000300010},  DOI={10.1590/S1516-89132003000300010},  number={3},  journal={Brazilian Archives of Biology and Technology},  publisher={Instituto de Tecnologia do Paraná - Tecpar},  author={Marques, Paulo Henrique C. and Oliveira, Haydée Torres de and Machado, Eunice da Costa},  year={2003},  month={Jun},  pages={383–394} }