Document Type : Research Paper
Author
.
.,. . (2003). .. Economics Research, 3(8), 139-155.
.,. . ".", Economics Research, 3, 8, 2003, 139-155.
. .. (2003). '.', Economics Research, 3(8), pp. 139-155.
. ., ".," Economics Research, 3 8 (2003): 139-155,
. .. .. Economics Research. 2003;3(8):139-155 (In Persian).
