@misc{1173341,
  author = {Gleen F Engen},
  title = {An Introduction to the description and evaluation of microwave systems using terminal invariant parameters:},
  year = {1969},
  month = {1969-01-01 05:01:00},
  publisher = {, National Institute of Standards and Technology, Gaithersburg, MD},
  doi = {https://doi.org/10.6028/NBS.MONO.112},
  language = {en},
}