@article{9211,
  author = {D. Heddle and J. Gallagher},
  title = {Measurements of electron impact optical excitation functions},
  year = {1989},
  journal = {Reviews of Modern Physics},
  volume = {61},
  pages = {221-278},
  month = {Jan-04-1989},
  issn = {0034-6861},
  url = {http://link.aps.org/doi/10.1103/RevModPhys.61.221},
  doi = {10.1103/RevModPhys.61.221},
}