@misc{106171,
  author = {Cedric Powell},
  title = {Evaluation of Formulas for Inner-shell Ionization Cross Sections},
  year = {1976},
  number = {460},
  month = {1976-12-01},
  publisher = {Special Publication (NIST SP), National Institute of Standards and Technology, Gaithersburg, MD},
  language = {en},
}