Document Type : Research Paper
Author
.
., .. (2004). . Economics Research, 4(12), 187-203.
., .. ".", Economics Research, 4, 12, 2004, 187-203.
. .. (2004). '.', Economics Research, 4(12), pp. 187-203.
. ., ".," Economics Research, 4 12 (2004): 187-203,
. .. . Economics Research. 2004;4(12):187-203 (In Persian).
