Eladio Domínguez Jorge Lloret Angel Luis Rubio María Antonia Zapata Elementary Translations: The Seesaws for Achieving Traceability Between Database Schemata. 377-389 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=3289&spage=377 2004 conf/er/2004w ER (Workshops) db/conf/er/erw2004.html#DominguezLRZ04