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1983. 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) . Boletim do Instituto Oceanográfico. 32, 1 (jan. 1983), 83–90. DOI:https://doi.org/10.1590/S1679-87591983000100009.