SKRZYSZEWSKA, Kinga - CHLANDA, J. A study on the variation of morphological characteristics of silver fir (Abies alba Mill.) seeds and their internal structure determined by X-ray radiography in the Beskud Sadecki and Beskid Niski mountain ranges of the Carpathians (southern Poland). In Journal of forest science. - Praha ; Praha : Ústav zemědělských a potravinářských informací : Institute of Agricultural Economics and Information, 2009. ISSN 1212-4834, 2009, vol. 55, no. 9, s.403- 414.