Prospects for precision measurements of atomic helium using direct frequency comb spectroscopy E. E. Eyler, D. E. Chieda, M. C. Stowe, M. J. Thorpe, T. R. Schibli and J. Ye Eur. Phys. J. D, 48 1 (2008) 43-55 Published online: 17 October 2007 DOI: 10.1140/epjd/e2007-00289-y