Authors
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.,. and .,. . (2006). .. Economics Research, 6(21), 81-120.
.,. , and .,. . ".", Economics Research, 6, 21, 2006, 81-120.
. ., . .. (2006). '.', Economics Research, 6(21), pp. 81-120.
. . and . ., ".," Economics Research, 6 21 (2006): 81-120,
. ., . .. .. Economics Research. 2006;6(21):81-120 (In Persian).
