1. Al-Shahwani, M. F., Al-Ghazali, M. R., and Al-Rawi, E. H.: 1987, Appl. Microbiol. Biotechnol. 25, 379.
2. Al-Shahwani, M. F. and Jazrawi, S. F.: 1985, Agricultural Wastes 14, 161.
3. American Public Health Association (APHA): 1980, Standard Methods for the Examination of Water and Wastewater (15th ed.), Public Health Association, Inc., New York.
4. Busch, P. L. and Stumm, W.: 1968, Environmental Science and Technology 2, 49.
5. Chang, Y., Pfeffer, J. T., and Chian, E. S. K.: 1980, Appl. Environ. Microbiol. 40, 1049.