Abstract
(1999). -. Journal of Economic Research (Tahghighat- E- Eghtesadi), 34(2), -.
. "-", Journal of Economic Research (Tahghighat- E- Eghtesadi), 34, 2, 1999, -.
(1999). '-', Journal of Economic Research (Tahghighat- E- Eghtesadi), 34(2), pp. -.
-. Journal of Economic Research (Tahghighat- E- Eghtesadi), 1999; 34(2): -.
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