@misc{indiciae3ad73dfe1598,
  title = {Evaluation of advanced geopotential models for operational orbit determination},
  author = {Radomski, M. S. and Davis, B. E. and Samii, M. V. and Engel, C. J. and Doll, C. E.},
  year = {1988},
  url = {https://ntrs.nasa.gov/citations/19890006591},
  note = {Source identifier: 19890006591}
}