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Browsing University Publications by Author "Hagras%2C Ahmed E. E. %5B%D8%A7%D8%AD%D9%85%D8%AF %D8%A7%D9%84%D9%88%D8%B2%D9%8A%D8%B1 %D9%87%D8%AC%D8%B1%D8%B3%5D"