1. ANALYSIS OF INDUSTRIAL WATER AMD WASTEWATER. (1971) American Society for Testing Materials. Method D1426–58.
2. Determination of nitrate in water by ultraviolet spectrophotometry;ARMSTRONG;Anal. Chem.,1963
3. Photo. oxidation of organic matter in sea water by ultraviolet radiation: Analytical and other applications;ARMSTRONG;Nature,1966
4. Violet d' anoline;BERTHELOT;Societe de chemie applique,1859
5. The determination of nitrate in sea water;CHOW;Anal. Chem.,1962