@conference{156801,
  author = {David Cooper},
  title = {A More Efficient Use of Δ-CRLs},
  year = {2000},
  month = {2000-05-01},
  publisher = {Security and Privacy, Symposium | 21st | | IEEE},
  url = {https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=151218},
  language = {en},
}