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From the following article:

Direct observation of electron dynamics in the attosecond domain

A. Föhlisch, P. Feulner, F. Hennies, A. Fink, D. Menzel, D. Sanchez-Portal, P. M. Echenique and W. Wurth

Nature 436, 373-376 (21 July 2005)

doi: 10.1038/nature03833