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2. American Public Health Association, Inc. 1965. Standard Methods for the Examination of Water and Wastewater. 12th ed. pp. 195-208. New York, N.Y.
3. A technique for the determination of lactose in milk by the Hagedorn-Jensen Method;Blackwood;J. Dairy Res.,1934
4. Richmond's Dairy Chemistry;Davis,1953
5. Nitrogen oxides—a challenge to chemical engineers;Faith;Chem. Eng. Prog.,1956