@misc{1172336,
  author = {Henry D Hubbard},
  title = {Units used to express the wave lengths of electromagnetic waves/:},
  year = {1930},
  month = {1930-01-01 05:01:00},
  publisher = {, National Institute of Standards and Technology, Gaithersburg, MD},
  doi = {https://doi.org/10.6028/NBS.MP.117},
  language = {en},
}