@misc{tp3801,
  title = {Sistemas de Recomendaciones: Herramientas para el Filtrado de Información},
  author = {Enrique Herrera-Viedma and Carlos Porcel and L. Hidalgo},
  year = {2004},
  journal = {Hipertext.net},
  pages = {227-227},
  url = {http://www.hipertext.net/web/pag227.htm},
  keywords = {misc},
}