@misc{indiciae85e01b9d945c,
  title = {Optical communication in free space},
  author = {Plotkin, H. H. and Mcavoy, N. and Fitzmaurice, M. W.},
  year = {1974},
  url = {https://ntrs.nasa.gov/citations/19750008759},
  note = {Source identifier: 19750008759}
}