@article{11126,
  author = {V. Čermák},
  title = {Individual Efficiency Curves for the Excitation of 23S and 21S States of Helium by Electron Impact},
  year = {1966},
  journal = {The Journal of Chemical Physics},
  volume = {44},
  pages = {3774},
  month = {Jan-01-1966},
  issn = {00219606},
  url = {http://link.aip.org/link/?JCP/44/3774/1\&Agg=doi},
  doi = {10.1063/1.1726533},
}