. (1993). -. (e25764). Journal of Economic Research (Tahghighat- E- Eghtesadi), 31(47), e25764

. "-" .e25764 , Journal of Economic Research (Tahghighat- E- Eghtesadi), 31, 47, 1993, e25764.

. (1993). '-', Journal of Economic Research (Tahghighat- E- Eghtesadi), 31(47), e25764.

, "-," Journal of Economic Research (Tahghighat- E- Eghtesadi), 31 47 (1993): e25764,

. -. J. Econ. Res.. 1993;31(47):e25764 (In Persian).