@article{Greuter2008,
  author    = {Werner Greuter},
  title     = {The flora of Psara (E. Aegean Islands, Greece) : an annotated catalogue},
  journal   = {Candollea : journal international de botanique syst{\´e}matique},
  volume    = {31},
  pages     = {191 -- 242},
  year      = {2008},
}