@congreso_internacional{540,
  author = {Francisco Herrera and Luis Martínez and Enrique Herrera-Viedma and Francisco Chiclana},
  title = {An information retrieval system with unbalanced linguistic information based on the linguistic 2-tuple model},
  year = {2002},
  month = {July 1-5th},
  publisher = {Ninth International Conference on Information Processing and Management of Uncertainty in Knowledge-Bases Systems. IPMU 2002},
  address = {, Annecy (France)},
}