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conferencePaper 5th Conference on Sewer Processes and Networks International Water Organisation (IWA) Delft, The Netherlands Zgheib S. Gromaire M.C. Lorgeoux C. Saad M. Chebbo G. Van de Meulen M. Ten Veldhuis J.A.E. Schilperoort R.P.S. Sterols: a tracer of organic matter in combined sewers 2007 275–286