@misc{indiciae1d1b32a9a566,
  title = {Study of geopotential error models used in orbit determination error analysis},
  author = {Yee, C. and Kelbel, D. and Lee, T. and Samii, M. V. and Mistretta, G. D. and Hart, R. C.},
  year = {1991},
  url = {https://ntrs.nasa.gov/citations/19920004865},
  note = {Source identifier: 19920004865}
}