@misc{indiciae83e58b74b16d,
  title = {A tunable birefringent Fabry-Perot interferometer.},
  author = {Ramsay, J. V. and Smartt, R. N.},
  year = {1966},
  url = {https://ntrs.nasa.gov/citations/19660057999},
  note = {Source identifier: 19660057999}
}