1. Realtime simulation of the conventional activated sludge process;Bryant;Proc. on the Joint Automatic Control Conference of the American Automatic Control Council,1972
2. Dynamic modeling and control strategies for the activated sludge process;Busby;Journal WPCF,1975
3. On intorducting a dummy state variable in modeling biochemical reaction process;Takamatsu;Env. Sym. Proc. on IFAC,1977
4. Control model for activated sludge waste water treatment process;Hämäläine;Proc. on IFAC,1957
5. Experimences on instrumentation and control of activated sludge plants;Aarinen;Proc. on IFAC,1978