F. Pajoum Shariati, M. Mehrnia, M. Sarrafzadeh, S. Rezaee, P. Mohtasham, C. Wisniewski, M. Heran, Performance of a Novel Hybrid Membrane Bioreactor: Effect of Bacterial Floc Size on Fouling, Chemical Engineering Transactions. 24 (2011) 781-786. doi:10.3303/CET1124131.