@conference{1696,
  author = {Christine Hackman and Judah Levine and Thomas Parker},
  title = {A Long-term Comparison of GPS Carrier-Phase Frequency Transfer and Two-way Satellite Time/Frequency Transfer},
  year = {2006},
  month = {2006-12},
  url = {http://tf.boulder.nist.gov/general/pdf/2210.pdf},
}