@article{10956,
  author = {G. Chamberlain and S. Smith and D. Heddle},
  title = {Excitation of the 2p State of Hydrogen by Electrons of Near-Threshold Energy},
  year = {1964},
  journal = {Physical Review Letters},
  volume = {12},
  pages = {647-649},
  month = {Jan-06-1964},
  issn = {0031-9007},
  doi = {10.1103/PhysRevLett.12.647},
}