Andreas Billig Susanne Busse Andreas Leicher Jörn Guy Süß Platform Independent Model Transformation Based on Triple. 493-512 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=3231&spage=493 2004 conf/middleware/2004 Middleware db/conf/middleware/middleware2004.html#BilligBLS04