@misc{indiciaeff94c2a16eec,
  title = {Fiber-optic proximity sensor},
  author = {Bejczy, A. K. and Hermann, W. A. and Primus, H. C.},
  year = {1980},
  url = {https://ntrs.nasa.gov/citations/19790000390},
  note = {Source identifier: 19790000390}
}