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		Journal of Korean Society of Industrial and Systems Engineering :: Vol.37 No.1 pp.9-25 DOI:https://doi.org/10.11627/jkise.2014.37.1.09 Open abstract    
Journal of Korean Society of Industrial and Systems Engineering :: Vol.37 No.1 pp.9-25
			DOI:https://doi.org/10.11627/jkise.2014.37.1.09
			 
			