1. Sub-department of Environmental Technology, P.O. Box 8129, 6700 EV Wageningen, The Netherlands
2. KWR Watercycle Research Institute, P.O. Box 1072, 3430 BB Nieuwegein, The Netherlands
3. Paques BV, P.O. Box 52, 8560 AB Balk, The Netherlands
4. UNESCO-IHE, P.O. Box 3015, 2601 DA Delft The Netherlands
5. Shell Exploration and Production International, Kesslerpark 1, 2288 GS Rijswijk, The Netherlands