@article{11591,
  author = {K. German and Richard Zare},
  title = {Optical Radio-Frequency Double Resonance in Molecules: The OH Radical},
  year = {1969},
  journal = {Physical Review Letters},
  volume = {23},
  pages = {1207-1209},
  month = {Jan-11-1969},
  issn = {0031-9007},
  doi = {10.1103/PhysRevLett.23.1207},
}