@ARTICLE{KRAU-12-SJ,
  author = {Leanid Krautsevich and Aliaksandr Lazouski and Fabio Martinelli and
	Artsiom Yautsiukhin},
  title = {Cost-Effective Enforcement of Access and Usage Control Policies under
	Uncertainties},
  journal = {IEEE Systems Journal. Special issue on Security and Privacy of Complex
	Systems},
  year = {2012},
  volume = {7},
  pages = {223--235},
  month = {June},
  doi = {http://dx.doi.org/10.1109/JSYST.2012.2221911}
}