@misc{69, author = {Enrique Herrera-Viedma and Carlos Porcel and L. Hidalgo}, title = {Sistemas de Recomendaciones: Herramientas para el Filtrado de InformaciĆ³n}, year = {2004}, journal = {Hipertext.net}, number = {2}, pages = {227-227}, url = {http://www.hipertext.net/web/pag227.htm}, }