@article{3645,
  author = {Andrew Ludlow and M. Boyd and Jun Ye and E. Peik and P. Schmidt},
  title = {Optical atomic clocks},
  year = {2015},
  journal = {Reviews of Modern Physics},
  volume = {87},
  pages = {637-701},
  month = {2015-06},
  issn = {0034-6861},
  url = {http://link.aps.org/article/10.1103/RevModPhys.87.637},
  doi = {10.1103/RevModPhys.87.637},
}