@misc{indiciaea9a1316b89de,
  title = {Spherical earth gravity and magnetic anomaly analysis by equivalent point source inversion},
  author = {Von Frese, R. R. B. and Hinze, W. J. and Braile, L. W.},
  year = {1981},
  url = {https://ntrs.nasa.gov/citations/19810047271},
  note = {Source identifier: 19810047271}
}