@misc{1166941,
  author = {H W Koch and J M Wyckoff},
  title = {Attenuation coefficients of high energy x-rays:},
  year = {1959},
  month = {1959-05-01 04:05:00},
  publisher = {, National Institute of Standards and Technology, Gaithersburg, MD},
  doi = {https://doi.org/10.6028/NBS.RPT.6313},
  language = {en},
}