@misc{55791,
  author = {C O'Brien and L. Buermann},
  title = {Comparison of the NIST and PTB Standards for Air Kerma and Low-Energy X-rays},
  year = {2009},
  number = {114},
  month = {2009-12-31},
  publisher = {Journal of Research (NIST JRES), National Institute of Standards and Technology, Gaithersburg, MD},
  url = {https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=903376},
  language = {en},
}