@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} }