@misc{indiciaea259877bb90c,
  title = {Programmed test patterns for multiterminal devices.},
  author = {Happ, W. W. and Mcintosh, F. J.},
  year = {1969},
  url = {https://ntrs.nasa.gov/citations/19690061615},
  note = {Source identifier: 19690061615}
}