Mikael Buchholtz Carlo Montangero Lara Perrone Simone Semprini 93-106 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=3267&spage=93 2004 conf/gc/2004 Global Computing db/conf/gc/gc2004.html#BuchholtzMPS04