Deyi Xiong Hongkui Yu Qun Liu Tagging Complex NEs with MaxEnt Models: Layered Structures Versus Extended Tagset. 537-544 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=3248&spage=537 2004 conf/ijcnlp/2004 IJCNLP db/conf/ijcnlp/ijcnlp2004.html#XiongYL04