@article{walker_1982,  title={The thecamoebae (Protozoa, Rhizopoda) of small Amazonian forest streams and their possible use as indicator organisms for waterquality },  volume={12},  ISSN={0044-5967},  url={https://doi.org/10.1590/1809-43921982123S079},  DOI={10.1590/1809-43921982123S079},  journal={Acta Amazonica},  publisher={Instituto Nacional de Pesquisas da Amazônia},  author={Walker, Ilse},  year={1982},  pages={79–86} }