Benjamin Braatz Markus Klein Gunnar Schröter Semantical Integration of Object-Oriented Viewpoint Specification Techniques. 602-626 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=3147&spage=602 2004 conf/dfg/2004 SoftSpez Final Report db/conf/dfg/softspez2004.html#BraatzKS04