Frederick Reiss Sriram Raghavan Rajasekar Krishnamurthy Huaiyu Zhu Shivakumar Vaithyanathan An Algebraic Approach to Rule-Based Information Extraction. 933-942 2008 ICDE http://dx.doi.org/10.1109/ICDE.2008.4497502 conf/icde/2008 db/conf/icde/icde2008.html#ReissRKZV08