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Journal of Applied Sciences 8 ( 15 ): 2764 - 2769 , 2008
G. Abdel-Nasser, A.M. Al-Omran, A.M. Falatah, A.S. Sheta and A.R. Al-Harbi
Journal of Applied Sciences 7 ( 13 ): 1699 - 1708 , 2007