@InProceedings{	  pretschner.ea:mechanisms:2008,
  author	= {A. Pretschner and M. Hilty and D. Basin and C. Schaefer
		  and T. Walter},
  booktitle	= {ASIACCS},
  language	= {USenglish},
  month		= 3,
  title		= {Mechanisms for Usage Control},
  year		= 2008,
  user		= {pretscha}
}