1. Fibre and Polymer Technology, KTH Royal Institute of Technology, Teknikringen 56,
SE-100 44 Stockholm, Sweden
2. Mechanics, Department
of Management and Engineering, The Institute of Technology, Linköping University, SE-581 83 Linköping,
Sweden
3. Wallenberg Wood Science Centre, KTH Royal Institute of Technology, Teknikringen 56,
SE-100 44 Stockholm, Sweden