@inproceedings{Straccia07, 
 Address = {Cancun, Mexico}, 
 Author = {Straccia, Umberto}, 
 Booktitle = {World Congress of the International Fuzzy Systems Association (IFSA-07)}, 
 Number = {4529}, 
 Pages = {125-134}, 
 Publisher = {Springer Verlag}, 
 Series = {Lecture Notes in Computer Science}, 
 Title = {Towards Vague Query Answering in Logic Programming for Logic-based Information 
Retrieval}, 
 Year = {2007}}