Olivera Marjanovic Managing the Normative Context of Composite E-services. 24-36 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=2853&spage=24 2003 conf/icws/2003e ICWS-Europe db/conf/icws/icwse2003.html#Marjanovic03