HOLEKSA, Jan et al. Altitudinal variability of stand structure and regeneration in the subalpine spruce forests of the Poľana biosphere reserve, Central Slovakia. In European journal of forest research. ISSN 1612-4669, 2007, vol. 126, no. 2, p. 303-313. 6 P04F 030 21. CCC, WOS, SCOPUS.