1. Biotechnical Faculty, University of Ljubljana, Ljubljana, Slovenia
2. Institute of Silviculture, University of Natural Resources and Life Sciences, Wien, Austria
3. Federal Research and Training Centre for Forest, Natural Hazards and Landscape, Wien, Austria
4. Department of Agriculture, University of Sassari, Sassari, Italy
5. EFIATLANTIC European Regional Office, Bordeaux, France
6. Faculty of Forest Sciences and Ecology, Vytautas Magnus University, Akademija, Kaunas, Lithuania