@article{269269,
      recid = {269269},
      author = {Ludlum, Robert,},
      title = {The Sigma protocol /},
      publisher = {St. Martin's Press,},
      address = {New York :},
      pages = {535 p. ;},
      year = {2001},
      url = {http://library.usi.edu/record/269269},
}