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2. “Recommended Practice in the Testing of Aeration and Oxygenation Devices,” Wastewater Equipment Council, Process Equipment Manufacturers’ Association, 1972.
3. W. W. Eckenfelder, Jr., Sewage Ind. Wastes 31, 60 (1959).
4. P. F. Morgan, and J. K. Bewtra, J. Water Poll. Control Fed. 32, 1047 (1960).
5. J. K. Bewtra and W. R. Nicholas, J. Water Poll. Control Fed. 36, 1195 (1964).