1. Institute of Macromolecular Chemistry, Czech Academy of Sciences, 162 06 Prague 6, Czech Republic
2. Faculty of Science, Charles University, 128 43 Prague 2, Czech Republic
3. Department of Material Sciences and Process Engineering, Institute of Wood Technology and Renewable Materials, BOKU–University of Natural Resources and Life Sciences Vienna, Tulln an der Donau A-3430, Austria
4. Wood K plus–Kompetenzzentrum Holz GmbH, Linz 4040, Austria