@misc{813126,
  author = {Gerald Cole and Dennis Branstad},
  title = {Design Alternatives for Computer Network Security},
  year = {1978},
  month = {1978-01-01 00:01:00},
  publisher = {Special Publication (NIST SP), National Institute of Standards and Technology, Gaithersburg, MD},
  doi = {https://doi.org/10.6028/NBS.SP.500-21v1},
  language = {en},
}