Franco Arcieri Fabio Fioravanti Enrico Nardelli Maurizio Talamo A Specification for Security Services on Computational Grids. 119-135 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=3270&spage=119 2004 conf/gsem/2004 GSEM db/conf/gsem/gsem2004.html#ArcieriFNT04