Tianchi Ma Lin Chen Cho-Li Wang Francis C. M. Lau G-PASS: Security Infrastructure for Grid Travelers. 301-308 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=3251&spage=301 2004 conf/gcc/2004 GCC db/conf/gcc/gcc2004.html#MaCWL04