@misc{1156006,
  author = {J Ralph Johler},
  title = {Zonal harmonics in low frequency terrestrial radio wave propagation.:},
  year = {1966},
  month = {1966-01-01 05:01:00},
  publisher = {, National Institute of Standards and Technology, Gaithersburg, MD},
  doi = {https://doi.org/10.6028/NBS.TN.335},
  language = {en},
}