@article{44731,
  author = {Benjamin Houlton and Daniel Sigman and Edward AG Schuur and Lars Hedin},
  title = {A climate-driven switch in plant nitrogen acquisition within tropical forest communities},
  year = {2007},
  journal = {Proceedings of the National Academy of Sciences},
  volume = {104},
  number = {21},
  pages = {8902{\textendash}8906},
  url = {http://www.pnas.org/content/104/21/8902.short},
  language = {eng},
}