Maximilian Frey Bernd-Holger Schlingloff Conformance of Distributed Systems. 163-179 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=2644&spage=163 2003 conf/pts/2003 TestCom db/conf/pts/testcom2003.html#FreyS03