@article{DBLP:journals/ipl/Gouda01,
  author    = {Mohamed G. Gouda},
  title     = {Elements of security: Closure, convergence, and protection},
  journal   = {Inf. Process. Lett.},
  volume    = {77},
  number    = {2-4},
  year      = {2001},
  pages     = {109-114},
  ee        = {http://dx.doi.org/10.1016/S0020-0190(00)00207-6},
  bibsource = {DBLP, http://dblp.uni-trier.de}
}