Authors
Irena Burzyńska
Forest Research Institute, Department of Silviculture and Genetics of Forest Trees, Poland
Jan Łukaszewicz
Forest Research Institute, Department of Silviculture and Genetics of Forest Trees, Poland
Wojciech Gil
Forest Research Institute, Department of Silviculture and Genetics of Forest Trees, Poland
Krzysztof Sztabkowski
Forest Research Institute, Laboratory of Natural Environment Chemistry, Poland