Authors
Paweł Lech
Forest Research Institute, Department of Forest Resources Management, Sękocin Stary, Raszyn, Poland
Robert Hildebrand
Forest Research Institute, Department of Forest Resources Management, Sękocin Stary, Raszyn, Poland
Jadwiga Małachowska
Forest Research Institute, Department of Forest Resources Management, Sękocin Stary, Raszyn, Poland