@misc{indiciae9cf094579a81,
  title = {A capability model for passive spheres at high altitudes},
  author = {Phibbs, R. G. and Staffanson, F. L.},
  year = {1969},
  url = {https://ntrs.nasa.gov/citations/19700009274},
  note = {Source identifier: 19700009274}
}