@article {3922,
	title = {Compact Access Control Labeling for Efficient Secure XML Query Evaluation},
	journal = {Data \& Knowledge Engineering (DKE)},
	volume = {60},
	year = {2007},
	pages = {326--344},
	doi = {10.1016/j.datak.2006.03.005},
	author = {Huaxin Zhang and Ning Zhang and Ken Salem and Donghui Zhuo}
}
