{{Cite conference| publisher = International Water Organisation (IWA)| pages = 275–286| editors = M. Van de Meulen, J.A.E. Ten Veldhuis, R.P.S. Schilperoort (eds.)| last1 = Zgheib| first1 = S.| last2 = Gromaire| first2 = M.C.| last3 = Lorgeoux| first3 = C.| last4 = Saad| first4 = M.| last5 = Chebbo| first5 = G.| title = Sterols: a tracer of organic matter in combined sewers| booktitle = 5th Conference on Sewer Processes and Networks| location = Delft, The Netherlands| date = 2007}}