@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}}