1. C. Audoin, B. Guinot, The Measurement of Time: Time, Frequency and the Atomic Clock (Cambridge University Press, Cambridge, 2001)
2. I. Ryuichi, I. Atsutoshi, T. Hiroshi, K. Hiromitsu, K. Moritaka, N. Junichi, K. Yasuhiro, K. Tetsuro, M. Morito, K. Shinobu, K. Kensuke, M. Shigeru, in Measuring the Future, Proc. Fifth IVS General Meet., ed. by A. Finkelstein, D. Behrend (Nauka, St. Petersburg, 2008), pp. 400–401
3. D. Chambon, S. Bize, M. Lours, A. Clairon, G. Santarelli, A. Luiten, M. Tobar, Rev. Sci. Instrum. 76, 094704 (2005)
4. S. Chang, A.G. Mann, A.N. Luiten, Electron. Lett. 36, 480 (2000)
5. A.D. Ludlow, X. Huang, M. Notcutt, T. Zanon-Willette, S.M. Foreman, M.M. Boyd, S. Blatt, J. Ye, Opt. Lett. 32, 641 (2007)