@article{Doerken2009,
  author    = {Veit Martin D{\"o}rken},
  title     = {Berg-Ahorn - Acer pseudoplatanus (Aceraceae) : Baum des Jahres 2009},
  volume    = {1},
  pages     = {183 -- 187},
  url       = {http://www.botanik-bochum.de/},
  year      = {2009},
}