Fei Chen 0002 Byron J. Gao AnHai Doan Jun Yang Raghu Ramakrishnan Optimizing complex extraction programs over evolving text data. 321-334 2009 SIGMOD Conference http://doi.acm.org/10.1145/1559845.1559881 conf/sigmod/2009 db/conf/sigmod/sigmod2009.html#ChenGDYR09