@article{3688,
  author = {Travis Nicholson and S. Campbell and Ross Hutson and Edward Marti and B. Bloom and R. McNally and W. Zhang and M. Barrett and Marianna Safronova and G. Strouse and W. Tew and Jun Ye},
  title = {Systematic evaluation of an atomic clock at 2 x 10-18 total uncertainty},
  year = {2015},
  journal = {Nature Communications},
  volume = {6},
  pages = {6896},
  month = {2015-04},
  url = {http://www.nature.com/ncomms/2015/150421/ncomms7896/full/ncomms7896.html},
  doi = {10.1038/ncomms7896},
}