@inproceedings{Ragone07, Author = {Azzurra Ragone, Umberto Straccia, Tommaso Di Noia, Eugenio Di Sciascio and Francesco M. Donini}, Booktitle = {4th European Semantic Web Conference (ESWC-07)}, Number = {4519}, Pages = {414---428}, Publisher = {Springer Verlag}, Series = {Lecture Notes in Computer Science}, Title = {Vague Knowledge Bases for Matchmaking in P2P E-Marketplaces}, Year = {2007}}