Kim, D. , Ryu, D. , Go, M. , Chang, D. , Han, S. , Hur, J. , Chung, B. , Kim, B. , Jin, Y. (2010). 'Nitrogen Removal in a High-efficiency Denitrification/Oxic Filter treatment System for Advanced Treatment of Municipal Wastewater'. World Academy of Science, Engineering and Technology, Open Science Index 48, International Journal of Environmental and Ecological Engineering, 4(12), 700 - 702.