@misc{indiciae0c815927aa5b,
  title = {Three-level signal sampler has automatic threshold},
  author = {Brokl, S. S. and Hurd, W. J. and Jurgens, R. F. and Rodemich, E. R.},
  year = {1977},
  url = {https://ntrs.nasa.gov/citations/19770000157},
  note = {Source identifier: 19770000157}
}