@inbook{wineland_bergquist_itano_diedrich_weimer_1989, 
  title={Frequency Standards in the Optical Spectrum}, 
  DOI={10.1007/978-3-642-88421-4_12}, 
  publisher={Springer Berlin Heidelberg}, 
  author={Wineland and Bergquist and Itano and Diedrich and Weimer}, 
  year={1989}
  }