@article{4827,
  author = {F. Robicheaux and Bo Gao},
  title = {Two-photon processes in real atoms},
  year = {1991},
  journal = {Physical Review Letters},
  volume = {67},
  pages = {3066-3069},
  month = {Jan-11-1991},
  issn = {0031-9007},
  url = {http://link.aps.org/doi/10.1103/PhysRevLett.67.3066},
  doi = {10.1103/PhysRevLett.67.3066},
}