Abstract
(1991). -. Journal of Economic Research (Tahghighat- E- Eghtesadi), 31(44), -.
. "-", Journal of Economic Research (Tahghighat- E- Eghtesadi), 31, 44, 1991, -.
(1991). '-', Journal of Economic Research (Tahghighat- E- Eghtesadi), 31(44), pp. -.
-. Journal of Economic Research (Tahghighat- E- Eghtesadi), 1991; 31(44): -.
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