Document Type : Research Article
Authors
1 Department of Applied Mathematics, Faculty of Mathematical Sciences, Ferdowsi University of Mashhad, Mashhad, Iran.
2 Department of Applied Mathematics, Faculty of Mathematical Sciences, Ferdowsi University of Mashhad, Mashhad, Iran
3 Faculty of Mathematics and Computer Science, Hakim Sabzevari University, Sabzevar, Iran
Abstract
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