@book{Lueth2009,
  author    = {Michael L{\"u}th},
  title     = {Felsen und Blockhalden / [Bearb.: Landesanstalt f{\"u}r Umweltschutz Baden-W{\"u}rttemberg, Abteilung 2, Referat 25. Autor: Michael L{\"u}th]},
  year      = {2009},
}