@article{PhysRevLett.110.230801,
  title = {Precision Measurement of the Hydrogen $1S\mathrm{\text{\ensuremath{-}}}2S$ Frequency via a 920-km Fiber Link},
  author = {Matveev, Arthur and Parthey, Christian G. and Predehl, Katharina and Alnis, Janis and Beyer, Axel and Holzwarth, Ronald and Udem, Thomas and Wilken, Tobias and Kolachevsky, Nikolai and Abgrall, Michel and Rovera, Daniele and Salomon, Christophe and Laurent, Philippe and Grosche, Gesine and Terra, Osama and Legero, Thomas and Schnatz, Harald and Weyers, Stefan and Altschul, Brett and H\"ansch, Theodor W.},
  journal = {Phys. Rev. Lett.},
  volume = {110},
  issue = {23},
  pages = {230801},
  numpages = {5},
  year = {2013},
  month = {Jun},
  publisher = {American Physical Society},
  doi = {10.1103/PhysRevLett.110.230801},
  url = {https://link.aps.org/doi/10.1103/PhysRevLett.110.230801}
}