@book{BlancheJaegerOppermann2008,
  author    = {Peter Blanch{\´e} and Rolf Jaeger and Volker Oppermann},
  title     = {W{\"o}lfe},
  edition   = {2. erweiterte Auflage, Stand Mai 2006},
  url       = {http://www.gzsdw.de},
  year      = {2008},
}