Gaetano Cascini Alessandro Fantechi Emilio Spinicci Natural Language Processing of Patents and Technical Documentation. 508-520 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=3163&spage=508 2004 conf/das/2004 Document Analysis Systems db/conf/das/das2004.html#CasciniFS04