1. Aquafin nv, Technology Department, Dijkstraat 8, B-2630 Aartselaar, Belgium
2. Department of Applied Ecology and Environmental Biology, Ghent University, J.Plateaustraat 22, B-9000 Gent, Belgium
3. Biomath Department, Ghent University, Coupure Links 653, B-9000 Gent, Belgium