1. APHA, AWWA and WPCF (1995) Standards Methods for the Examination of Water and Wastewater, 18th ed. American Public Health Association, Washington, DC, USA.
2. Ball J. W., Nordstrom D. K. and Jenne E. A. (1980) Additional and revised thermochemical data and computer code for WATEQ 2. Report No WRI-78-116. US Geological Survey Water Resources Division, Menlo Park, CA, USA, 109 pp.
3. Bioleaching of metals from sewage sludge by sulfur-oxidizing bacteria;Blais;J. Environ. Engng. Div. ASCE,1992
4. Metals removal from sewage sludge by indigenous iron-oxidizing bacteria;Blais;J. Environ. Sci. Health,1993
5. Boothman W. S. (1988) Characterization of trace metal associations with polluted marine sediments by selective extraction. In Chemical and Biological Characterization of Sludges, Sediments, Dredge Spoils, and Drelling Muds, eds Lichenberg J. J., Winter F. A., Weber C. I., Fradheim L., American Society Test. Mater. Spec. Tech. Publ., USA, pp. 81–92.