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2. Humic Substances in Soil, Sediment and Water,1985
3. Vertical distribution of primary production and phytoplankton in two small lakes with different humus concentration in southern Finland;Arvola;Holarct. Ecol.,1984
4. Acid–base titration and hydrolysis of fulvic acid from the Suwannee River;Bowles,1989
5. The automated determination of nitrate in seawater;Brewer;J. Mar. Res.,1966