1. Department
of Forest Products
Technology, School of Chemical Technology, Aalto University, P.O. Box 16300, 00076 Aalto, Finland
2. Finnish Forest Research Institute Metla, P.O. Box 18, FI-01301, Vantaa,
Finland
3. VTT Technical Research Centre of Finland, P.O. Box 1000, FI-02044 VTT, Finland