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- [5] ACTIVATED SLUDGE STUDIES .4. SLUDGE AGE AND ITS EFFECT ON THE ACTIVATED SLUDGE PROCESS SEWAGE AND INDUSTRIAL WASTES, 1953, 25 (08): : 898 - 908
- [6] Respiratory quotient of activated sludge and of activated sludge-sewage mixtures INDUSTRIAL AND ENGINEERING CHEMISTRY, 1939, 31 : 1042 - 1047