Ilya Zaihrayeu Lei Sun Fausto Giunchiglia Wei Pan Qi Ju Mingmin Chi Xuanjing Huang From Web Directories to Ontologies: Natural Language Processing Challenges. 623-636 2007 conf/semweb/2007 ISWC/ASWC http://dx.doi.org/10.1007/978-3-540-76298-0_45 db/conf/semweb/iswc2007.html#ZaihrayeuSGPJCH07