@misc{1173661,
  author = {Newbern Smith},
  title = {A graphical method for calculating ground reflection coefficients:},
  year = {1945},
  month = {1945-01-01 05:01:00},
  publisher = {, National Institute of Standards and Technology, Gaithersburg, MD},
  doi = {https://doi.org/10.6028/NBS.IRPL.14},
  language = {en},
}