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Nitrogen Forms and Total Phosphorus in Water Courses: a Study at Maringá Stream, Paraná State - Doi: 10.4025 actascitechnol.V35i4.14018. Acta Sci. Technol. 2013, 35 (4), 711-716. https://doi.org/10.4025/actascitechnol.v35i4.14018.