@misc{indiciae9ab5d6b6b329,
  title = {The Goddard general orbit determination system},
  author = {Cole, I. J. and Murphy, J. P. and Siry, J. W.},
  year = {1968},
  url = {https://ntrs.nasa.gov/citations/19690008667},
  note = {Source identifier: 19690008667}
}