Document Type : Research Paper
Authors
1 Department of Applied Mathematics, Ferdowsi University of Mashhad, Mash- had, Iran
2 Department of Applied Mathematics, Ferdowsi University of Mashhad, Mashhad, Iran.
3 Department of Mathematics, Universiti Putra Malaysia, 43400 Serdang, Selangor, Malaysia
4 Department of Science, School of Mathematical Sciences, University of Zabol, Zabol, Iran
Abstract
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