1. Relationship of activated sludge bulking to oxygen tension;Bhatla;J. Water Pollut. Control Fed.,1967
2. Flocculation phenomena in biological systems;Boyle,1968
3. Role of Activated Sludge Final Settling Tanks;Dick;J. sanit. Engng Div. ASCE 96,1970
4. Effect of process variables on sludge floc formation and settling characteristics;Ford;J. Water Pollut. Control Fed.,1967
5. Studies on activated sludge bulking II, bulking induced by domestic sewage;Heukelekian;Sewage Works J.,1940