1. Biotechnical Faculty, Department of Wood Science and Technology, University of Ljubljana, SI1000 Ljubljana, Slovenia
2. Institute of Sustainable Processes, Valladolid University, Dr. Mergelina s/n., 47011 Valladolid, Spain
3. Department of Chemical Engineering and Environmental Technology, University of Valladolid, Dr. Mergelina s/n., 47011 Valladolid, Spain