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		Korean Journal of Environment and Ecology :: Vol.31 No.5 pp.455-460 DOI:https://doi.org/10.13047/KJEE.2017.31.5.455 Open abstract    
Korean Journal of Environment and Ecology :: Vol.31 No.5 pp.455-460
			DOI:https://doi.org/10.13047/KJEE.2017.31.5.455
			 
			