1. Multivariate analysis of environmental data for two hydrographic basins;Andrade;Anal. Lett.,1992
2. AOAC (1990) Official Methods of Analysis, Vol. 1, 15th edn., Association of Official Analytical Chemists, Arlington, VI, U.S.A., p. 312
3. APHA-AWWA-WPCF (1985) Standard Methods for the Examination of Water and Wastewater, 16th edn., American Public Health Association, American Water Works Association, Water Pollution Control Federation, U.S.A
4. Multivariate data analysis applied to the investigation of river pollution;Aruga;Fresenius J. Anal. Chem.,1993
5. Classification of the quality of surface waters by means of pattern recognition;Bartels;Anal. Chim. Acta,1985