1. NIST Physical Measurements Laboratory, Bibliography of Photon Total Cross Section (Attenuation Coefficient) Measurements, https://www.nist.gov/pml/bibliography-photon-total-cross-section-attenuation-coefficient-measurements
2. NIST Physical Measurements Laboratory, X-Ray Mass Attenuation Coefficients, https://www.nist.gov/pml/x-ray-mass-attenuation-coefficients
3. Center for X-Ray Optics, Lawrence Berkeley National Laboratory, X-Ray Interactions with Matter, http://henke.lbl.gov/optical_constants/
4. J.A.R. Samson, L. Yin, J. Opt. Soc. Am. B6, 2326–2333 (1989)
5. G.C. Angel, J.A.R. Samson, Phys. Rev. A 38, 5578–5585 (1988)