@misc{indiciaece39281336a9,
  title = {A precision autocollimating solar sensor.},
  author = {Hall, J. M. and Johnson, D. F. and Melugin, R. K.},
  year = {1969},
  url = {https://ntrs.nasa.gov/citations/19690061397},
  note = {Source identifier: 19690061397}
}