(2013). . , 7(2), 395-402. doi: 10.22059/ijer.2013.618
. "". , 7, 2, 2013, 395-402. doi: 10.22059/ijer.2013.618
(2013). '', , 7(2), pp. 395-402. doi: 10.22059/ijer.2013.618
. , 2013; 7(2): 395-402. doi: 10.22059/ijer.2013.618


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