Vinay K. Chaudhri Kenneth S. Murray John Pacheco Peter Clark Bruce W. Porter Patrick J. Hayes Graph-Based Acquisition of Expressive Knowledge. 231-247 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=3257&spage=231 2004 conf/ekaw/2004 EKAW db/conf/ekaw/ekaw2004.html#ChaudhriMPCPH04