@conference{590,
  author = {D. Sullivan and Judah Levine},
  title = {Time and frequency metrology},
  year = {2001},
  publisher = {Narosa Publishing House},
  isbn = {ISBN-10: 8173190046 ISBN-13: 978-8173190049},
  url = {http://tf.boulder.nist.gov/general/pdf/1094.pdf},
  note = {JILA Pub. 6097},
}