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2. “Effect of water temperature on stream reaeration”;Churchill;Thirty-First Progress Report, Committee on Sanitary Engineering Research, San. Eng. Div., ASCE,1961
3. “Approaches to mixing operation scale-up”, Chem;Connolly;Eng. Prog.,1969
4. “Factors affecting the aeration efficiency of sewage and industrial wastes”;Eckenfelder;J. W.P.C.F.,1959
5. Biological Waste Treatment;Eckenfelder,1961