@InProceedings{bcrv07,
  author =        {Lujo Bauer and Lorrie Faith Cranor and Michael K. Reiter and Kami Vaniea},
  title =         {Lessons learned from the deployment of a smartphone-based access-control system},
  month =         jul,
  year =          2007,
  booktitle =     {SOUPS '07: Proceedings of the 3rd Symposium on Usable Privacy and Security},
  publisher =     {ACM},
  copyright =     {authors},
  pages =         {64--75},
  doi =           {10.1145/1280680.1280689},
  url =           {http://www.ece.cmu.edu/~lbauer/papers/2007/soups2007.pdf}
}