1. Neste Oy Corporate Technology, P O Box 310, FIN-06101 Porvoo, Finland
2. Ahlstrom Pyropower, Hans Ahlstrom Laboratory, FIN-48601 Karhula, Finland
3. University of Kuopio, Department of Environmenial Sciences, P O. Box 1627, FIN-70211 Kuopio, Finland