@article(2006-wordnet-based-index-terms-expansion-for-geographical-information-retrieval,
  author = {Davide Buscaldi and Paolo Rosso and Emilio Sanchis Arnal},
  title = {WordNet-based Index Terms Expansion for Geographical Information Retrieval},
  year = {2006},
  journal = {CLEF. Cross Language Evaluation Forum},
  pages = {50-54}
)