4Rosenberger, S., Laabs, C., ect. Impact of colloidal and soluble organic material on membrane performance in membrane bioreactors for municipal wastewater treatment[J]. War. Res., 2006, 40(4): 710-720
5Henning Dierks. PLC-automata: a new class of implementable real time automata[J]. Theoretical computer science, 2001. 253(4) : 34-37
