@article{Walther_2011,
   title={Precision measurements in ion traps using slowly moving standing waves},
   volume={107},
   ISSN={1432-0649},
   url={http://dx.doi.org/10.1007/s00340-011-4740-8},
   DOI={10.1007/s00340-011-4740-8},
   number={4},
   journal={Applied Physics B},
   publisher={Springer Science and Business Media LLC},
   author={Walther, A. and Poschinger, U. and Singer, K. and Schmidt-Kaler, F.},
   year={2011},
   month={Oct},
   pages={1061–1067}
}