@article{6993,
  author = {J.E.M. Goldsmith and A. Smith},
  title = {Doppler-free two-photon optogalvanic spectroscopy in helium},
  year = {1980},
  journal = {Optics Communications},
  volume = {32},
  pages = {403-405},
  month = {Jan-03-1980},
  issn = {00304018},
  url = {http://linkinghub.elsevier.com/retrieve/pii/0030401880902709},
  doi = {10.1016/0030-4018(80)90270-9},
}