@InCollection{	  agreiter.ea:technical:2007,
  author	= {B. Agreiter and M. Alam and R. Breu and M. Hafner and A.
		  Pretschner and J.-P. Seifert and X. Zhang},
  booktitle	= {ACM Workshop on Secure Web Services},
  language	= {USenglish},
  month		= 11,
  pages		= {18--25},
  publisher	= {ACM},
  title		= {A Technical Architecture for Enforcing Usage Control
		  Requirements in Service-Oriented Architectures},
  year		= 2007,
  user		= {pretscha}
}