@misc{indiciaec514f035cbb0,
  title = {An Integrable IF Amplifier of High Stability},
  author = {Kerwin, W. J. and Shaffer, C. V.},
  year = {1968},
  url = {https://ntrs.nasa.gov/citations/19680025221},
  note = {Source identifier: 19680025221}
}