@book{BreunigDemuth2009,
  author    = {Thomas Breunig and Siegfried Demuth},
  title     = {Rote Liste der Farn- und Samenpflanzen Baden-W{\"u}rttembergs},
  edition   = {3., neu bearb. Fassung, Stand 15.4.1999},
  isbn      = {3-88251-271-7},
  year      = {2009},
}