@misc{indiciae939c2893771d,
  title = {PPM to analog converter},
  author = {Ceresa, R. D. and Harris, D. L. and Kopsidas, R. K. and Stattel, R. J.},
  year = {1969},
  url = {https://ntrs.nasa.gov/citations/19700012187},
  note = {Source identifier: 19700012187}
}