@misc{indiciae6ea6470b3139,
  title = {Covering a sphere with retroreflectors},
  author = {Clouse, D. and Liebe, C. C. and Padgett, C. and Bartman, R.},
  year = {2001},
  url = {https://ntrs.nasa.gov/citations/20060033531},
  note = {Source identifier: 20060033531}
}