@article{ReifWalentowski2008,
  author    = {Albert Reif and Helge Walentowski},
  title     = {The assessment of naturalness and its role for nature conservation and forestry in Europe},
  journal   = {Wald{\"o}kologie, Landschaftsforschung und Naturschutz},
  number    = {6},
  pages     = {63 -- 76},
  year      = {2008},
}