Christina Yip Chung Raymond Lieu Jinhui Liu Alpha K. Luk Jianchang Mao Prabhakar Raghavan Thematic mapping - from unstructured documents to taxonomies. 608-610 2002 conf/cikm/2002 CIKM http://doi.acm.org/10.1145/584792.584892 db/conf/cikm/cikm2002.html#ChungLLLMR02