Institution: | 1. Department of Mathematics, Faculty of Basic Sciences, Birjand University, Birjand, Iran 2. Department of Information and Service Economy, School of Economics, Aalto University, Helsinki, Finland 3. Department of Mathematics, Tehran Tarbiat Moallem University, Tehran, Iran 4. Information and Service Economy, School of Economics, Aalto University, Helsinki, Finland 5. Department of Mathematics, Science & Research Branch, Islamic Azad University, Tehran, Iran 6. Viroquant Research Group Modeling, University of Heidelberg, Bioquant BQ26, Heidelberg, Germany
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