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2. American Public Health Association, Standard Methods for the Examination of Water and Wastewater, eighteenth ed., American Public Health Association, Washington, DC, 1992.
3. Micro semiautomated analysis of surface and waste waters for chemical oxygen demand
4. Determination of low chemical oxygen demand values in water by the dichromate semi-micro method
5. Rapid and precise method for the determination of the chemical oxygen demand of factory effluent samples