Frequency Standards in the Optical Spectrum [chapter]

D. J. Wineland, J. C. Bergquist, W. M. Itano, F. Diedrich, C. S. Weimer
1989 The Hydrogen Atom  
doi:10.1007/978-3-642-88421-4_12 fatcat:3bjrlr6ubbfhbkjd6kxqi6iwcy