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American Journal of Applied Sciences 8 ( 6 ): 547 - 553 , 2011
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American Journal of Applied Sciences 8 ( 6 ): 617 - 627 , 2011
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International Business Management 7 ( 2 ): 78 - 83 , 2013
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International Business Management 7 ( 2 ): 109 - 113 , 2013
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Research Journal of Applied Sciences 7 ( 8 ): 370 - 381 , 2012