@congreso_internacional{460,
  author = {Luis Martínez and Macarena Espinilla and Jun Liu},
  title = {Extended Linguistic Hierarchies},
  year = {2008},
  pages = {825-830},
  month = {November 17-19th},
  publisher = {International Conference on Intelligent System and Knowledge Engineering (ISKE2008)},
  address = {National Natural Science Foundation of China, Xiamen (China)},
}