@misc{1195861,
  author = {E B Barker},
  title = {Recommendation for digital signature timeliness:},
  year = {2009},
  month = {2009-01-01 05:01:00},
  publisher = {, National Institute of Standards and Technology, Gaithersburg, MD},
  doi = {https://doi.org/10.6028/NIST.SP.800-102},
  language = {en},
}