@article{Doerken2009,
  author    = {Veit Martin D{\"o}rken},
  title     = {Spitz-Ahorn - Acer platanoides (Aceraceae)},
  volume    = {1},
  pages     = {180 -- 182},
  url       = {http://www.botanik-bochum.de/},
  year      = {2009},
}