@book{noauthororeditor1986funktion,
  author = {Frey, Hans Dieter and Henning, Peter and Langer, Ewald and Wagner, Gitta and Weigner, Christiane},
  editor = {DIFF, Tübingen:},
  interhash = {218022dff6141265174d53519b19a13f},
  intrahash = {3bebcc8158b3140b6dcd5469893b8a32},
  title = {Bau und Funktion der Niederen Pflanzen (Algen, Moose, Farne)},
  url = {http://www.fachportal-paedagogik.de/fis_bildung/suche/fis_set.html?FId=544320},
  year = 1988
}