1. Extended Aeration Effluent Polishing by Mixing Media Filtration;Culp;Water and Sewage Works,1967
2. Theory of Water Filtration;O'Melia;Jour. AWWA,1967
3. Experimental Evaluation of Sand Filtration Theory;Fox;Proc. ASCE. J. San. Eng. Div.,1966
4. Conley , W. R. Hsiung , K.-Ying Design and Application of Multi-Media Filters Paper Presented at the AWWA National Conference Cleveland, Ohio 1968
5. Hudson , H. E. Jr. Physical Aspects of Filtration Paper Presented at the AWWA National Conference Cleveland, Ohio 1968