@article{carvalho_sant'anna_gemelgo_azevedo_2007,  title={Cyanobacterial occurrence and detection of microcystin by planar chromatography in surface water of Billings and Guarapiranga Reservoirs, SP, Brazil},  volume={30},  ISSN={0100-8404},  url={https://doi.org/10.1590/S0100-84042007000100014},  DOI={10.1590/S0100-84042007000100014},  number={1},  journal={Brazilian Journal of Botany},  publisher={Sociedade Botânica de São Paulo},  author={Carvalho, Luciana R. de and Sant'Anna, Célia L. and Gemelgo, Marcina C.P. and Azevedo, Maria Teresa de P.},  year={2007},  month={Jan},  pages={141–148} }