1. Henze M, Grady Jr CPL, Gujer W, Marais GR, Matsuo T. Activated Sludge Model No.1. IAWQ Scientific and Technical Report No. 1. London, UK: IAWQ; 1987.
2. Henze M, Gujer W, Takahashi M, Matsuo T, Wentzel MC, Marais GR. Activated Sludge Model No. 2. IAWQ Scientific and Technical Report No. 3. London, UK: IAWQ; 1995.
3. Activated Sludge Model No. 3;Gujer;Water Sci Technol,1999
4. Construction of COD simulation model for activated sludge process by fuzzy neural network;Tomida;J Biosci Bioeng,1999
5. Construction of COD simulation model for activated sludge process by recursive fuzzy neural network;Tomida;J Chem Eng Jpn,2001