@misc{indiciae7fa14c9a1b34,
  title = {Group-delay standards},
  author = {Beatty, R. W. and Derr, L. J. and Otoshi, T. Y.},
  year = {1979},
  url = {https://ntrs.nasa.gov/citations/19790000014},
  note = {Source identifier: 19790000014}
}