@conference{GrGS07,
	author = {Christin Groba and Stephan Groß and Thomas Springer},
	title = {Context-Dependent Access Control for Contextual Information. Proceedings of the Second International Conference on Availability, Reliability and Security (ARES 2007)},
	year = {2007},
	address = {Vienna, Austria},
	month = {4}
}