@article{sassi_1991,  title={Phytoplankton and environmental factors in the Paraíba do Norte River Estuary, northeastern Brazil: composition, distribution and quantitative remarks},  volume={39},  ISSN={0373-5524},  url={https://doi.org/10.1590/S0373-55241991000200001},  DOI={10.1590/S0373-55241991000200001},  number={2},  journal={Boletim do Instituto Oceanográfico},  publisher={Instituto Oceanográfico da Universidade de São Paulo},  author={Sassi, Roberto},  year={1991},  pages={93–115} }