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2. Anonymous: 1983, Determination of Orthophosphate in Water by Flow Injection Analysis, Tecator Application Note ASN 60-01/83, Tecator AB, Höganäs, Sweden.
3. Abrahamsen, G., Horntvcdt, R., and Tveite, B.: 1975, Impacts of Acid Precipitation on Coniferous Forest Ecosystems, SNFS project, Fagrapport 2/75, Oslo-Ås.
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