@misc{indiciae679aaf49a019,
  title = {Does the geoid drift west?},
  author = {Backus, G. E. and Parker, R. L. and Zumberge, M. A.},
  year = {1985},
  url = {https://ntrs.nasa.gov/citations/19860003424},
  note = {Source identifier: 19860003424}
}