Fuzzy Control of the Activated Sludge Wastewater Treatment Process Treated as Multivariable Process - Chiroşcă, Alina; Dumitraşcu, George; Luca, Laurențiu; Caraman, Sergiu (The Annals of “Dunarea de Jos“ University of Galati. Fascicle III, Electrotechnics, Electronics, Automatic Control, Informatics, 2011)