@misc{1154136,
  author = {Robert William Beatty},
  title = {Calculated and measured S₁₁, S₂₁, and group delay for simple types of coaxial and rectangular waveguide 2-port standards:},
  year = {1974},
  month = {1974-01-01 05:01:00},
  publisher = {, National Institute of Standards and Technology, Gaithersburg, MD},
  doi = {https://doi.org/10.6028/NBS.TN.657},
  language = {en},
}