@article{278,
  author = {Preston Christopher D.},
  title = {Which vascular plants are found at the northern or southern edges of their European range in the British Isles?},
  year = {2007},
  journal = {Watsonia},
  volume = {26},
  pages = {253-270},
  month = {2007},
  url = {http://www.archive.bsbi.org.uk/Wats26p253.pdf},
  language = {eng},
}