@InProceedings{Loyer04a,
author =       "Loyer, Yann and Straccia, Umberto",
title =        "The Approximate Well-founded Semantics for Logic Programs with Uncertainty",  
booktitle =    29th International Symposium on Mathematical Foundations of Computer Science (MFCS-2004),
publisher =    "Springer Verlag",
series =       "Lecture Notes in Computer Science",
number =       "3153",
pages  = "513-524",
address ="Bratislava, Slovak Republic",
year	="2004"
}