@conference{7517,
  author = {J. Wahr and D. Larden},
  title = {An Analysis of Lunar Laser Ranging Data for the Earth\textquoterights Free Core Nutation},
  year = {1983},
  publisher = {Lubrecht \& Cramer Limited},
  address = {New York City},
  isbn = {3510651138, 9783510651139},
  note = {JILA Pub. 2323},
}