@article{137356,
  author = {Stephen Seltzer and F. Bergstrom},
  title = {Changes in the U.S. Primary Standards for the Air Kerma from Gamma-Ray Beams},
  year = {2003},
  number = {108},
  month = {2003-01-01},
  publisher = {Journal of Research of the National Institute of Standards and Technology},
  language = {en},
}