1. Al-Doori, Z., Kaddouri, M., Clor, A., and Naom, I.: 1986, J. Biological Sciences Research
17, 195.
2. Anthony, J. K. and Lampky, J. R.: 1983, Journal WPCF
55, 506.
3. APHA: 1980, Standard Methods for Examination of Water and Wastewater, American Public Health Association, Washington, DC 20036.
4. Armstrong, J. L., Shigeno, D. S., Calomiris, J. J., and Seidler, R. J.: 1981, Appl. Environ. Microbial.
42, 277.
5. Armstrong, J. L., Calomiris, J. J., and Seidler, R. J.: 1982, Appl. Environ. Microbial.
44, 308.