@misc{indiciaef073bc219d88,
  title = {Electronically tuned optical filters},
  author = {Castellano, J. A. and Pasierb, E. F. and Oh, C. S. and Mccaffrey, M. T.},
  year = {1972},
  url = {https://ntrs.nasa.gov/citations/19720012962},
  note = {Source identifier: 19720012962}
}