@article{10580,
  author = {S. Lee and J. Helmcke and John Hall and B. Stoicheff},
  title = {Doppler-free two-photon transitions to Rydberg levels: convenient, useful, and precise reference wavelengths for dye lasers},
  year = {1978},
  journal = {Optics Letters},
  volume = {3},
  pages = {141},
  month = {Jan-01-1978},
  issn = {0146-9592},
  doi = {10.1364/OL.3.000141},
}