@misc{indiciae069aee64b3cd,
  title = {Ray tracing studies for the topside ionosphere.},
  author = {Colin, L. and Mcculley, G. and Shmoys, J.},
  year = {1969},
  url = {https://ntrs.nasa.gov/citations/19690040849},
  note = {Source identifier: 19690040849}
}