Von Welch Frank Siebenlist Ian T. Foster John Bresnahan Karl Czajkowski Jarek Gawor Carl Kesselman Sam Meder Laura Pearlman Steven Tuecke Security for Grid Services http://arxiv.org/abs/cs.CR/0306129 2003 CoRR cs.CR/0306129 db/journals/corr/corr0306.html#cs-CR-0306129