Shawn Bowers Lois M. L. Delcambre The Uni-level Description: A Uniform Framework for Representing Information in Multiple Data Models. 45-58 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=2813&spage=45 2003 conf/er/2003 ER db/conf/er/er2003.html#BowersD03