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Abdul Wahab, N. and Katebi, M.R. and Balderud, J. and , Malaysian Government and Malaysia, University of Technology (Fun (2009) Multivariable PID control design for activated sludge process with nitrification and denitrification. Biochemical Engineering Journal, 45 (3). pp. 239-248. ISSN 1369-703X
Abdul Wahab, N. and Katebi, M.R. and Balderud, J. (2007) Multi-variable PID control design for wastewater system. In: 15th IEEE Mediterranean Conference on Control and Automation, (MED07), 27-29 June 2007, 2007-06-27 - 2007-06-29.