Document Type : Research Paper
Authors
1 Associate Professor, Department of Economics, Bu-Ali Sina University, Hamedan, Iran
2 Assistance Professor, Cranfield Water Science Institute, School of Applied Sciences, Cranfield University, Cranfield, MK43 0AL, UK.
3 Assistance Professor, Faculty of Mathematics and statistic science, University of Malayer, Iran
4 MA., Islamic Azad University of Science and Research of Ahvaz, Iran
5 Payamnour University, Harsin, Kermanshah, Iran
Abstract
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