Dragan Havelka Christian Schulte Per Brand Seif Haridi Thread-Based Mobility in Oz. 137-148 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=3389&spage=137 2004 conf/moz/2004 MOZ db/conf/moz/moz2004.html#HavelkaSBH04