@misc{136421,
  author = {J Hubbell and Stephen Seltzer},
  title = {Tables of X-Ray Mass Attenuation Coefficients and Mass Energy-Absorption Coefficients 1 keV to 20 MeV for Elements Z = 1 to 92 and 48 Additional Substances of Dosimetric Interest},
  year = {1995},
  month = {1995-01-01},
  publisher = {http://physics.nist.gov/PhysRefData/XrayMassCoef/cover.html},
  language = {en},
}