@article{1310996,
  author = {J Herbst and R Watson and J Wilkins},
  title = {4f Excitation Energies in Rare-Earth Metals: Relativistic Calculations},
  year = {1976},
  number = {13},
  month = {1976-02-15 00:02:00},
  publisher = {Physical Review B (Condensed Matter and Materials Physics)},
  url = {https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=620108},
  language = {en},
}