@misc{indiciaebc7a418c5fec,
  title = {A versatile electrical shutter for optical pumping experiments},
  author = {Fralick, R. D. and Zipf, E. C.},
  year = {1970},
  url = {https://ntrs.nasa.gov/citations/19700043856},
  note = {Source identifier: 19700043856}
}