@article{9502,
  author = {C. Opal and W. Peterson and Earl Beaty},
  title = {Measurements of Secondary-Electron Spectra Produced by Electron Impact Ionization of a Number of Simple Gases},
  year = {1971},
  journal = {The Journal of Chemical Physics},
  volume = {55},
  pages = {4100},
  month = {Jan-01-1971},
  issn = {00219606},
  doi = {10.1063/1.1676707},
}