@congreso_internacional{476,
  author = {Macarena Espinilla and Rosa María Rodríguez and Luis Martínez and Francisco Mata and Jun Liu},
  title = {Optimizing the Method for Building an Extended Linguistic Hierarchy},
  year = {2009},
  volume = {2009},
  pages = {815-820},
  month = {November 30th - December 2nd},
  publisher = {ISDA 09. Ninth International Conference on Intelligent Systems Design and Applications},
  address = {IEEE Computer Society, Pisa (Italy)},
}