Hai Dong Farookh Khadeer Hussain Elizabeth Chang State of the Art in Semantic Focused Crawlers. 910-924 2009 ICCSA (2) http://dx.doi.org/10.1007/978-3-642-02457-3_74 conf/iccsa/2009-2 db/conf/iccsa/iccsa2009-2.html#DongHC09