(2013). . , 7(2), 343-358. doi: 10.22059/ijer.2013.612
. "". , 7, 2, 2013, 343-358. doi: 10.22059/ijer.2013.612
(2013). '', , 7(2), pp. 343-358. doi: 10.22059/ijer.2013.612
. , 2013; 7(2): 343-358. doi: 10.22059/ijer.2013.612


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