@article{783951,
  author = {U Sterr and C Degenhardt and H Stoehr and Ch. Lisdat and H Schnatz and J Helmcke and F Riehle and G Wilpers and Christopher Oates and Leo Hollberg},
  title = {The optical calcium frequency standards of PTB and NIST},
  year = {2004},
  number = {5},
  month = {2004-11-05 00:11:00},
  publisher = {Comptes Rendus Mathematique},
  url = {https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=50037},
  language = {en},
}