Document Type : Research Article
Authors
1 Non Government Higher Education Institute of Fazilat, Semnan, Iran
2 Department of Economics, Semnan University, Semnan, Iran
3 School of Engineering, Damghan University, P.O. Box 36716-41167, Damghan, Iran
4 Department of Mathematics, Semnan University, P.O. Box 35195-363, Semnan, Iran
Abstract
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