A high-resolution Ramsey-Bordé spectrometer for optical clocks based on cold Mg atoms J. Keupp, A. Douillet, T. E. Mehlstäubler, N. Rehbein, E. M. Rasel and W. Ertmer Eur. Phys. J. D, 36 3 (2005) 289-294 Published online: 17 November 2005 DOI: 10.1140/epjd/e2005-00302-7