Eirinaios Michelakis Rajasekar Krishnamurthy Peter J. Haas Shivakumar Vaithyanathan Uncertainty management in rule-based information extraction systems. 101-114 2009 SIGMOD Conference http://doi.acm.org/10.1145/1559845.1559858 conf/sigmod/2009 db/conf/sigmod/sigmod2009.html#MichelakisKHV09