Abstract
(1987). -. Journal of Economic Research (Tahghighat- E- Eghtesadi), 31(39), -.
. "-", Journal of Economic Research (Tahghighat- E- Eghtesadi), 31, 39, 1987, -.
(1987). '-', Journal of Economic Research (Tahghighat- E- Eghtesadi), 31(39), pp. -.
-. Journal of Economic Research (Tahghighat- E- Eghtesadi), 1987; 31(39): -.
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