@inproceedings{Straccia05c,
	Address = {Melbourne, Australia},
	Author = {Straccia, Umberto},
	Booktitle = {9th International Conference on Knowledge-Based \& Intelligent Information \& Engineering Systems (KES-05)}, 
	Editor = {Rajiv Khosla and  Robert J. Howlett and Lakhmi C. Jain},
	Number = {3682}, 
	Pages = {753-760},
	Publisher = {Springer Verlag},
	Series = {Lecture Notes in Computer Science},
	Title = {Uncertainty Management in Logic Programming: Simple and Effective Top-Down Query Answering}, 
	Volume = {Part II},
	Year = {2005}}