@misc{1172741,
  author = {R G Merrill and W V Mansfield},
  title = {Radiation patterns in the lower ionosphere and Fresnal zones for elevated antennas over a spherical earth:},
  year = {1962},
  month = {1962-01-01 05:01:00},
  publisher = {, National Institute of Standards and Technology, Gaithersburg, MD},
  doi = {https://doi.org/10.6028/NBS.MONO.38},
  language = {en},
}