@misc{indiciaefc20bc8ddb1d,
  title = {Geopotential research mission, science, engineering and program summary},
  author = {Keating, T. and Taylor, P. and Kahn, W. and Lerch, F.},
  year = {1986},
  url = {https://ntrs.nasa.gov/citations/19860021621},
  note = {Source identifier: 19860021621}
}