Pedro Valderas Joan Fons Vicente Pelechano Extending Navigation Modelling to Support Content Aggregation in Web Sites. 98-102 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=3140&spage=98 2004 conf/icwe/2004 ICWE db/conf/icwe/icwe2004.html#ValderasFP04