Document Type : Original Article
Authors
1 Department of Mathematics, Basic Sciences Faculty, University of Bonab, Bonab 5551395133, Iran. E-mail: p.atashpeykar@ubonab.ac.ir
2 Department of Mathematics, Basic Sciences Faculty, University of Bonab, Bonab 5551395133, Iran. E-mail: haji.badali@ubonab.ac.ir
Abstract
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