@inproceedings{EDOC-2006-SunMY,
	author        = "Yuqing Sun and Xiangxu Meng and Fang Yin",
	booktitle     = "{Proceedings of the 10th International Enterprise Distributed Object Computing Conference}",
	doi           = "10.1109/EDOC.2006.11",
	isbn          = "0-7695-2558-X",
	pages         = "488--491",
	publisher     = "{IEEE Computer Society}",
	title         = "{A Novel Approach for Role Hierarchies in Flexible RBAC Workflow}",
	year          = 2006,
}