Bernhard Schätz Chris Salzmann Service-Based Systems Engineering: Consistent Combination of Services. 86-104 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=2885&spage=86 2003 conf/icfem/2003 ICFEM db/conf/icfem/icfem2003.html#SchatzS03