@misc{indiciae61ae959c6e43,
  title = {Geomagnetic Cutoff Rigidity Computer Program: Theory, Software Description and Example},
  author = {Smart, D. F. and Shea, M. A.},
  year = {2001},
  url = {https://ntrs.nasa.gov/citations/20010071975},
  note = {Source identifier: 20010071975}
}