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IVth. Conf. Microbiol., Cairo : Egyptian Sciety of Microbiology, pp. Vol. 1: Soil, Food and Industrial Microbiology, 411-442, 1980.
Khatibi, A., H. H. Zedan, A. A. Salama, and E. O. M. Tayeb,
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IVth Conf. Microbiol., Cairo : Egyptian Society of Microbioogy, pp. Vol. I: Soil, Food and Industrial Microbiol., pp. 443-449, 1980.