@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}}