@misc{29851,
  author = {C O'Brien and D Burns and C Kessler},
  title = {Key Comparison BIPM.RI(I)-K2 of the air-kerma standards of the NIST, USA and the BIPM in low-energy x-rays},
  year = {2012},
  month = {2012-03-23},
  publisher = {http://iopscience.iop.org},
  language = {en},
}