@misc{1191866,
  author = {Richard S Hunter},
  title = {Circular of the Bureau of Standards no. 429::photoelectric tristimulus colorimetry with three filters},
  year = {1942},
  month = {1942-01-01 05:01:00},
  publisher = {, National Institute of Standards and Technology, Gaithersburg, MD},
  doi = {https://doi.org/10.6028/NBS.CIRC.429},
  language = {en},
}