Document Type : Research Paper
Authors
.
., .., ., .., & ., .. (2002). . Economics Research, 2(6), 125-134.
., .., ., .., & ., .. ".", Economics Research, 2, 6, 2002, 125-134.
. .., . .., . .. (2002). '.', Economics Research, 2(6), pp. 125-134.
. ., . . & . ., ".," Economics Research, 2 6 (2002): 125-134,
. .., . .., . .. . Economics Research. 2002;2(6):125-134 (In Persian).
