@misc{indiciae8cd3c83c6e9f,
  title = {Gravity fields},
  author = {Sjogren, W. L. and Anderson, J. D. and Phillips, R. J. and Trask, D. W.},
  year = {1976},
  url = {https://ntrs.nasa.gov/citations/19760052657},
  note = {Source identifier: 19760052657}
}