Isabelle Attali Denis Caromel Arnaud Contes Hierarchical and Declarative Security for Grid Applications. 363-372 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=2913&spage=363 2003 conf/hipc/2003 HiPC db/conf/hipc/hipc2003.html#AttaliCC03