@techreport{DoerkenJagel2008,
  author    = {Veit Martin D{\"o}rken and Armin Jagel},
  title     = {Besenheide und Schneeheide - Winterbl{\"u}her der Friedh{\"o}fe - Calluna vulgaris, Erica carnea (Ericaceae)},
  pages     = {3},
  year      = {2008},
}