@INPROCEEDINGS{KRAU-11-CRiSIS,
  author = {Leanid Krautsevich and Aliaksandr Lazouski and Fabio Martinelli and
	Artsiom Yautsiukhin},
  title = {Cost-effective Enforcement of UCON Policies},
  booktitle = {Proceedings of the 6th International Conference on Risks and Security
	of Internet and Systems. To appear.},
  year = {2011},
  publisher = {IEEE Computer Press}
}