@congreso_internacional{507,
  author = {Luis Martínez and Luis Gonzaga Pérez and Pedro José Sánchez and Beatriz Montes},
  title = {A Heterogeneous Multi-criteria Hierarchical Evaluation Model For Web site Services},
  year = {2005},
  pages = {1577-1580},
  month = {July 21-26th},
  publisher = {10th International Conference on Fuzzy Theory and Technology},
  address = {, Salt Lake City (Utah) USA},
}