Sabri Pllana Thomas Fahringer Johannes Testori Siegfried Benkner Ivona Brandic Towards an UML Based Graphical Representation of Grid Workflow Applications. 149-158 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=3165&spage=149 2004 conf/eagc/2004 European Across Grids Conference db/conf/eagc/eagc2004.html#PllanaFTBB04