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Ahmed H. Khater
Department of Mathematics, Faculty of Science, Cairo University, Beni–Suef, Egypt Physics Department, UIA, University of Antwerp, B–2610 Antwerp, Belgium
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Abdulazeem A. Abdallah
Department of Mathematics, Faculty of Science, Cairo University, Beni–Suef, Egypt
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Omar H. El–Kalaawy
Department of Mathematics, Faculty of Science, Cairo University, Beni–Suef, Egypt
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Dirk K. Callebaut
Physics Department, UIA, University of Antwerp, B–2610 Antwerp, Belgium