Luo Xiao Dieter Wissmann Michael Brown Stefan Jablonski Where to Position the Precision in Knowledge Extraction from Text. 187-196 2001 conf/ieaaie/2001 IEA/AIE http://link.springer.de/link/service/series/0558/bibs/2070/20700187.htm db/conf/ieaaie/ieaaie2001.html#XiaoWBJ01a