Trenyik, Petra, et al. “Examination the Health State With Instrumental Measurements and the Diversity of Sessile Oak Stands in Zemplén Mountains”. COLUMELLA – Journal of Agricultural and Environmental Sciences, vol. 4, no. 1, June 2017, pp. 21-30, https://doi.org/10.18380/SZIE.COLUM.2017.4.1.21.