1. Beeftink H. H. (1987) Anaerobic Bacterial Aggregates. Ph.D. thesis, University of Amsterdam, The Netherlands
2. Microelectrode measurements in nitrifying aggregates;De Beer;Appl. Env. Microbiol.,1993
3. Kwok W. K., van Loosdrecht, M. C. M. and Heijnen, J. J. (1996) Application of a biofilm airlift suspension reactor for acetic acid removal. Internal report, Delft University of Technology, Delft, The Netherlands
4. Lettinga G., Hulshoff Pol L. W. and Zeeman, G. (1993) Biologische Waterzuivering, Anaërobe Zuivering (biological Wastewater Treatment, Anaerobic Treatment). Department of Environmental Technology, Wageningen Agricultural University, The Netherlands
5. Aerobic granular sludge in a sequencing batch reactor;Morgenroth;Water Res.,1997