“Nitrogen Forms and Total Phosphorus in Water Courses: a Study at Maringá Stream, Paraná State - Doi: 10.4025 actascitechnol.V35i4.14018”. Acta Scientiarum. Technology, vol. 35, nº 4, maio de 2013, p. 711-6, https://doi.org/10.4025/actascitechnol.v35i4.14018.