@proceedings{13179,
  author = {N. Ashby and Peter Bender and John Hall and Jun Ye and Scott Diddams and S. Jefferts and Nathan Newbury and C. Oates and R. Dolesi and S. Vitale and W. Weber},
  title = {Measurement of gravitational time delay using drag-free spacecraft and an optical clock},
  year = {2009},
  journal = {Proceedings of the International Astronomical Union},
  volume = {5},
  pages = {414},
  month = {2009-04},
  issn = {1743-9213},
  doi = {10.1017/S1743921309990718},
}