Peter Fettke Peter Loos Multiperspective Evaluation of Reference Models - Towards a Framework. 80-91 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=2814&spage=80 2003 conf/er/2003w ER (Workshops) db/conf/er/erw2003.html#FettkeL03