Paolo Mancarella Giacomo Terreni Francesca Toni Web Sites Verification: An Abductive Logic Programming Tool. 434-435 2007 conf/iclp/2007 ICLP http://dx.doi.org/10.1007/978-3-540-74610-2_33 db/conf/iclp/iclp2007.html#MancarellaTT07