@misc{46536,
  author = {Barbara Belzer},
  title = {NIST Handbook 150-21, NVLAP Chemical Calibration: Certifiers of Spectrophotometric NTRMs},
  year = {2011},
  month = {2011-06-14},
  publisher = {Handbook (NIST HB), National Institute of Standards and Technology, Gaithersburg, MD},
  url = {https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=907800},
  language = {en},
}