Seung-Hyun Kim Kyong Hoon Kim Jong Kim Sung Je Hong Sangwan Kim Workflow-Based Authorization Service in the Grid. 43-55 2004 2 J. Grid Comput. 1 http://www.springerlink.com/index/10.1007/s10723-004-2080-1 db/journals/grid/grid2.html#KimKKHK04