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Nejad, A. , Ferdowsi, F. , Mashhadi, R.. "Factors of Non-Conformity Behavior and the Emergence of a Ponzi Game in the Riba-Free (Interest-Free) Banking System of Iran". World Academy of Science, Engineering and Technology, Open Science Index 133, International Journal of Economics and Management Engineering, (2018), 12(1), 67 - 75.