@conference{89091,
  author = {Judah Levine},
  title = {Steering a Time Scale},
  year = {2008},
  month = {2008-12-01},
  publisher = {Proc. 2008 PTTI Conf., Reston, VA},
  url = {https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=901112},
  language = {en},
}