@misc{indiciae87797206c586,
  title = {Long-wavelength variations in earth's geoid - Physical models and dynamical implications},
  author = {Hager, B. H. and Richards, M. A.},
  year = {1989},
  url = {https://ntrs.nasa.gov/citations/19900034873},
  note = {Source identifier: 19900034873}
}