@article{804226,
  author = {K Szymaniec and W Chalupczak and Eite Tiesinga and Carl Williams and S Weyers and R. Wynands},
  title = {Cancellation of the Collisional Frequency Shift in Caesium Fountain Clocks},
  year = {2007},
  number = {98},
  month = {2007-04-13 00:04:00},
  publisher = {Physical Review Letters},
  language = {en},
}