@misc{indiciae5dc70a44af14,
  title = {Three-dimensional images exhibiting a Gray scale from binary computer generated Fresnel holograms.},
  author = {Ballard, G. S. and Ware, R. E.},
  year = {1968},
  url = {https://ntrs.nasa.gov/citations/19680055025},
  note = {Source identifier: 19680055025}
}