Document Type : Original Article
Authors
1 Department of Mathematics, Faculty of Sciences, Urmia University, Urmia, Iran
2 Department of Mathematics and Computer Science, Amirkabir University of Technology (Tehran Polytechnic), Iran
3 Department of Mathematics, Farhangian University of Kermanshah, Kermanshah, Iran
4 Department of Mathematics, Faculty of Basic Sciences Ilam University P.O. Box 69315-516 Ilam, Iran
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