Document Type : Research Paper
Authors
1 Department of Mathematics, Faculty of Mathematical sciences, University of Mazandaran, P.O. Box: 47416-95447, Babolsar, Iran.
2 Department of Applied Mathematics, University of Mazandaran, P.O. Box: 47416-95447, Babolsar, Iran
3 Department of Mathematics, Faculty of Mathematics, Statistics and Computer Science, Semnan University, Semnan, Iran
Abstract
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