@ARTICLE{Li:CBM2007,
  author =       {Gonzalo Alvarez and Shujun Li and Luis Hernandez},
  title =        {Analysis of security problems in a medical image encryption system},
  journal =      {Computers in Biology and Medicine},
  year =         {2007},
  volume =       {37},
  number =       {3},
  pages =        {424-427},
  doi =          {10.1016/j.compbiomed.2006.04.002},
  note =         {preprint available online at \url{http://www.hooklee.com/pub.html}},
}