. (1993). -. (e25760). Journal of Economic Research (Tahghighat- E- Eghtesadi), 31(47), e25760

. "-" .e25760 , Journal of Economic Research (Tahghighat- E- Eghtesadi), 31, 47, 1993, e25760.

. (1993). '-', Journal of Economic Research (Tahghighat- E- Eghtesadi), 31(47), e25760.

, "-," Journal of Economic Research (Tahghighat- E- Eghtesadi), 31 47 (1993): e25760,

. -. J. Econ. Res.. 1993;31(47):e25760 (In Persian).