@misc{indiciaef4d72bdee2ae,
  title = {Photon generators and engines for laser power transmission},
  author = {Ahlstrom, H. G. and Hertzberg, A. and Johnston, E. W.},
  year = {1971},
  url = {https://ntrs.nasa.gov/citations/19710037860},
  note = {Source identifier: 19710037860}
}