@TechReport{tr2004:polymertr,
  author = 	 {Lujo Bauer and Jay Ligatti and David Walker},
  title = 	 {A Language and System for Composing Security Policies},
  institution =  {Princeton University},
  month =        jan,
  year = 	 {2004},
  number = 	 {TR-699-04},
  url =          {https://www.ece.cmu.edu/~lbauer/papers/polymer-tr-699-04.pdf}
}