Document Type : Research Paper
Author
.
., .. (2002). . Economics Research, 2(4), 255-259.
., .. ".", Economics Research, 2, 4, 2002, 255-259.
. .. (2002). '.', Economics Research, 2(4), pp. 255-259.
. ., ".," Economics Research, 2 4 (2002): 255-259,
. .. . Economics Research. 2002;2(4):255-259 (In Persian).
