@misc{indiciae9d618eb1d1a0,
  title = {Atmospheric density variations at 140 kilometers deduced from precise satellite radar tracking data.},
  author = {Devries, L. L. and Schusterman, L. and Bruce, R. W.},
  year = {1972},
  url = {https://ntrs.nasa.gov/citations/19720042744},
  note = {Source identifier: 19720042744}
}