(2009). . , 3(4), 671-680. doi: 10.22059/ijer.2010.83
. "". , 3, 4, 2009, 671-680. doi: 10.22059/ijer.2010.83
(2009). '', , 3(4), pp. 671-680. doi: 10.22059/ijer.2010.83
. , 2009; 3(4): 671-680. doi: 10.22059/ijer.2010.83


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