@misc{66471,
  author = {Yoshihiro Ohno},
  title = {NIST Measurement Services: Photometric Calibration},
  year = {1997},
  month = {1997-01-01},
  publisher = {Special Publication (NIST SP), National Institute of Standards and Technology, Gaithersburg, MD},
  url = {https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=104697},
  language = {en},
}