@article{11418,
  author = {R. Damburg and Sydney Geltman},
  title = {Excitation of n=2 States in Hydrogen by Electron Impact},
  year = {1968},
  journal = {Physical Review Letters},
  volume = {20},
  pages = {485-487},
  month = {Jan-03-1968},
  issn = {0031-9007},
  doi = {10.1103/PhysRevLett.20.485},
}