Document Type : Scientific-research
. (2006). . The Mirror of Knowledge, 6(2), 17-.
. "", The Mirror of Knowledge, 6, 2, 2006, 17-.
. (2006). '', The Mirror of Knowledge, 6(2), pp. 17-.
, "," The Mirror of Knowledge, 6 2 (2006): 17-,
. . The Mirror of Knowledge. 2006;6(2):17- (In Persian).
