Prospects for precision measurements of atomic helium using direct frequency comb spectroscopyE. E. Eyler, D. E. Chieda, M. C. Stowe, M. J. Thorpe, T. R. Schibli and J. YeEur. Phys. J. D, 48 1 (2008) 43-55DOI: https://doi.org/10.1140/epjd/e2007-00289-y