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Authors: |
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Z. Kishka - Dept. of Math., Faculty of Science, Sohag University, Sohag 82524, Egypt.
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M. Abdalla - Dept. of Math., Faculty of Science, South Valley University, Qena 83523, Egypt.
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A. Elrawy - Dept. of Math., Faculty of Science, South Valley University, Qena 83523, Egypt.
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