@article{schmidt_1983,  title={Some observations on marine phytoplankton kinetics: 2. The effect of nitrate and ammonium concentrations on the growth and uptake rates of the natural population of Ubatuba region, SP (23ºS, 045ºW)},  volume={32},  ISSN={0373-5524},  url={https://doi.org/10.1590/S0373-55241983000100009},  DOI={10.1590/S0373-55241983000100009},  number={1},  journal={Boletim do Instituto Oceanográfico},  publisher={Instituto Oceanográfico da Universidade de São Paulo},  author={Schmidt, Gilda},  year={1983},  pages={83–90} }