Jiayu Zhou Youfang Lin Shi Wang Cungen Cao Discover hierarchical lexical hyponymy relation from large-scale concept set. 205-214 2008 IEEE ICCI http://dx.doi.org/10.1109/COGINF.2008.4639170 conf/IEEEicci/2008 db/conf/IEEEicci/IEEEicci2008.html#ZhouLWC08