@inproceedings{Straccia05b, 
Year = {2005}, 
Title = {Query Answering in Normal Logic Programs under Uncertainty}, 
Number = {3571}, 
Address = {Barcelona, Spain}
Pages = {687-700}, 
publisher =    "Springer Verlag", 
series =       "Lecture Notes in Computer Science", 
Booktitle = {8th European Conferences on Symbolic and Quantitative Approaches to Reasoning with Uncertainty (ECSQARU-05)},  
Author = {Straccia, Umberto} 
}