@article{27396,
  author = {David Leibrandt and Michael Thorpe and Till Rosenband},
  title = {Shifts of optical frequency references based on spectral hole burning in Eu3+:Y2SiO5},
  year = {2013},
  number = {15},
  month = {2013-03-06},
  publisher = {Physical Review B},
  url = {https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=912630},
  language = {en},
}