References
   -  T.C. Schwartz and B.R Herring, The first year’s performance of a
    membrane bioreactor compared with conventional wastewater
    treatment of domestic waste. Proc., WEFTEC, 2001. 
-  New Logic Research, Inc., http://www.vsep.com. 
-  S.C. Low, H.H. Juan and L.K. Siong, A combined VSEP and MBR
    system, Desalination, 183 (2005) 353–362. 
-  G. Genkin, T.D. Waite, A.G. Fane and S, Cheng, The effects of
    vibration and coagulant addition on filtration performance of
    submerged hollow fibre membranes. J. Membr. Sci., 281 (2006)
	  726–734.