This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.
Małgorzata Falencka-Jabłońska
Forest Research Institute, Department of Forest Ecology, Sękocin Stary, Braci Leśnej 3, 05-090 Raszyn, Poland
Małgorzata Sułkowska
Forest Research Institute, Department of Silviculture and Genetics, Sękocin Stary, Braci Leśnej 3, 05-090 Raszyn, Poland, phone: +48 22 7150461, fax: +48 22 7200397