@article{espondaijis06,
  author =	 {F. Esponda and E. S. Ackley and P. Helman and H. Jia
                  and Stephanie Forrest},
  title =	 {Protecting Data Privacy through Hard-to-Reverse
                  Negative Databases},
  journal =	 {International Journal of Information Security},
  pages =	 {403-416},
  month =	 {October},
  Volume =	 {6},
  Number =	 {6},
  year =	 {2007}
}