@conference{7715,
  author = {Peter Bender and D. Larden},
  title = {TOPEX Orbit Determination Using GPS Signals Plus a Sidetone Ranging System},
  year = {1983},
  publisher = {Las Cruces, NM, New Mexico State University},
  address = {Las Cruces, NM},
  note = {JILA Pub. 2453},
}