@conference{1009,
  author = {Christine Hackman and Judah Levine},
  title = {New frequency comparisons using GPS carrier-phase time transfer},
  year = {2003},
  month = {2003-05},
  publisher = {IEEE},
  address = {Tampa, Fl, USA},
  doi = {10.1109/FREQ.2003.1275099},
}