@misc{1176551,
  author = {S Treado and W Remmert and J Bean},
  title = {Sky luminance and direct beam illuminance:},
  year = {1986},
  month = {1986-01-01 05:01:00},
  publisher = {, National Institute of Standards and Technology, Gaithersburg, MD},
  doi = {https://doi.org/10.6028/NBS.IR.85-3251},
  language = {en},
}