@article{9346,
  author = {A. Burgess and David Hummer and J. Tully},
  title = {Electron Impact Excitation of Positive Ions},
  year = {1970},
  journal = {Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences},
  volume = {266},
  pages = {225-279},
  month = {May-04-1972},
  issn = {1364-503X},
  doi = {10.1098/rsta.1970.0007},
}