Manuela Angioni Roberto Demontis Massimo Deriu Emanuela De Vita Cristian Lai Ivan Marcialis Gavino Paddeu Antonio Pintus Andrea Piras Raffaella Sanna Alessandro Soro Franco Tuveri A Collaborative, Semantic and Context Aware Search Engine. 213-218 2007 conf/iceis/2007-4 ICEIS (4) db/conf/iceis/iceis2007-4.html#AngioniDDVLMPPPSST07