@misc{35686,
  author = {Elaine Barker},
  title = {Recommendation for Digital Signature Timeliness},
  year = {2009},
  month = {2009-09-23},
  publisher = {Special Publication (NIST SP), National Institute of Standards and Technology, Gaithersburg, MD},
  url = {https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=901593},
  language = {en},
}