Authors
Krzysztof Kamiński
krzysztof.kaminski@radom.lasy.gov.pl
Regional Directorate State Forests in Radom, Pionki, Poland
Grzegorz Szewczyk
University of Agriculture in Krakow, Faculty of Forestry, Kraków, Poland
Janusz Kocel
Forest Research Institute, Department of Forest Resources Management, Raszyn, Poland