@InProceedings{Loyer03c, author = "Loyer, Yann and Straccia, Umberto", title = "The Approximate Well-founded Semantics for Logic Programs with Uncertainty", booktitle = 28th International Symposium on Mathematical Foundations of Computer Science (MFCS-2003), publisher = "Springer Verlag", series = "Lecture Notes in Computer Science", number = "2747", pages = "541-550", address ="Bratislava, Slovak Republic", year ="2003" }