@article {DiazGervas2005, title = {Personalisation in news delivery systems: Item summarization and multi-tier item selection using relevance feedback}, journal = {Web Intelligence and Agent System}, volume = {3}, number = {3}, year = {2005}, pages = {135-154}, address = {Amsterdam, The Netherlands, The Netherlands}, url = {http://iospress.metapress.com/content/a06vjv8bn24q1u0e/fulltext.pdf}, attachments = {http://nil.fdi.ucm.es/sites/default/files/Diaz\%26Gervas2005\%20\%28WIAS\%29.pdf}, author = {D{\'\i}az, Alberto and Pablo Gerv{\'a}s} }