Document Type : Original Article
Authors
1 Department of Mathematics, Faculty of Science, Benha University, Benha 13518, Egypt. E-mail: amrsoleiman@yahoo.com
2 Department of Mathematics, Faculty of Science, Benha University, Benha, Egypt. Email: alahelgendi@yahoo.com
3 Department of Mathematics, Faculty of Science, Benha University, Benha, Egypt. E-mail: a.m.abdelsalam@fsc.bu.edu.eg
Abstract
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