@article{9220,
  author = {Judah Levine and M. Weiss and D. Davis and D. Allan and D. Sullivan},
  title = {The NIST automated computer time service},
  year = {1989},
  journal = {Journal of Research of the National Institute of Standards and Technology},
  volume = {94},
  pages = {311\textendash321},
  url = {http://tf.nist.gov/general/pdf/844.pdf},
  note = {JILA Pub. 4149},
}