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Krzysztof Ukalski
Warsaw University of Life Sciences – SGGW, Faculty of Applied Informatics and Mathematics, Department of Econometrics and Statistics, Biometry Division, Nowoursynowska 159, 02-776 Warsaw, Poland
Marcin Klisz
Forest Research Institute, Department of Silviculture and Genetics, Braci Leśnej 3, Sękocin Stary, 05-090 Raszyn, Poland