@misc{1190976,
  author = {M Schulkin},
  title = {Average radio ray refraction in the lower atmosphere:},
  year = {1947},
  month = {1947-01-01 05:01:00},
  publisher = {, National Institute of Standards and Technology, Gaithersburg, MD},
  doi = {https://doi.org/10.6028/NBS.CRPL.2-2},
  language = {en},
}