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3. Collins , M. T. J. B. Gratzek D. L. Dawe T. G. Nemetz 1975b The effect of antibábterial agents on nitrification in an aquatic recirculating system Presented at the 5th Midwest Fish Disease Conference Southern Illinois University
4. Nitrification in the activated sludge process;Downing;Journal and Proceedings of the Institute of Sewage Purification,1964