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I.M. Hanafy
Department of Mathematics and Computer Science, Faculty of Science, Port Said University, Egypt
A. A. Salama
Department of Mathematics and Computer Science, Faculty of Science, Port Said University, Egypt
O. M. Khaled
Department of Mathematics and Computer Science, Faculty of Science, Port Said University, Egypt
K. M. Mahfouz
Department of Mathematics and Computer Science, Faculty of Science, Port Said University, Egypt