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Arash Derakhshanmehr,  The Theoretical Framework of the Necessity of Conducting Operational Auditing in Iran.   journal   = {International Journal of Social, Behavioral, Educational, Economic, Business and Industrial Engineering}, [online]. World Academy of Science, Engineering and Technology. August 2012, vol. 68(8). 2099 - 2102[viewed 20 July 2018]. Available from: http://waset.org/publications/12265.