1. Department of Mechanical Wood Technology, Faculty of Forestry and Wood Technology, Poznan University of Life Sciences, 60-627 Poznan, Poland
2. Department of Chemistry, Faculty of Forestry and Wood Technology, Poznan University of Life Sciences, 60-625 Poznan, Poland
3. Department of Forest Harvesting, Logistics and Ameliorations, Faculty of Forestry, Technical University in Zvolen, T.G. Masaryka 24, 960 01 Zvolen, Slovakia
4. Department of Physics and Biophysics, Poznan University of Life Sciences, 60-637 Poznan, Poland