@article{258798,
      recid = {258798},
      author = {Churchhouse, R. F.},
      title = {Codes and ciphers : Julius Caesar, the Enigma, and the  internet /},
      publisher = {Cambridge University Press,},
      address = {Cambridge ;},
      pages = {x, 240 p. :},
      year = {2002},
      url = {http://library.usi.edu/record/258798},
}