@article{173021,
  author = {P Leo and Paul Julienne and F Mies and Carl Williams},
  title = {Collisional Frequency Shifts in <sup>133</sup>Cs Fountain Clocks},
  year = {2001},
  number = {86},
  month = {2001-04-01},
  publisher = {Physical Review Letters},
  language = {en},
}