@misc{indiciae6f9d337b0619,
  title = {An Introduction to JPL's Orbit Determination Program},
  author = {Panagiotacoupulos, N. D. and Zielenbach, J. W. and Duesing, R. W.},
  year = {1974},
  url = {https://ntrs.nasa.gov/citations/20090028619},
  note = {Source identifier: 20090028619}
}