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Authors: |
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A. Raafat - Department of Physics, Faculty of Science, Al-Azhar University, Cairo, Egypt
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A. A. El-Sharkawy - Department of Physics, Faculty of Science, Al-Azhar University, Cairo, Egypt
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A. M. Abousehly - Department of Physics, Faculty of Science, Al-Azhar University, Assiut, Egypt
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M. T. Dessouky - Department of Physics, Faculty of Science, Al-Azhar University, Cairo, Egypt
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