1. Nitrate Removal From Drinking Water—Review
2. A Simple Spectrophotometric Determination of Nitrate in Water, Resin, and Soil Extracts
3. Standard Methods for the Examination of Water and Wastewater, 7th ed., American Public Health Association, Washington, DC, 1989, p. 4-110, 4-131.
4. Technical Rule Brazilian Association, ABNT, NBR 12620, Brazil, 1990.
5. Standard Methods of Chemical Analysis, 6th ed., vol. 2, Part B; vol. 3, Part B, Robert E. Krieger Publishing Company, Florida, 1975, p. 2445, 1890.