CHYTRÝ, Milan, Andreas EXNER, Richard HRIVNÁK, Karol UJHÁZY, Milan VALACHOVIČ and Wolfgang WILLNER. Context-dependence of diagnostic species: A case study of the Central European spruce forests.
Folia Geobotanica. Pruhonice: Institute of Botany, 2002, vol. 37, No 4, p. 403-417. ISSN 1211-9520.