Comment on "Photoionization of helium atoms irradiated with intense vacuum ultraviolet free-electron laser light. Part I. Experimental study of multiphoton and single-photon processes"
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Dimitrios Charalambidis, P. Tzallas, N. A. Papadogiannis, L. A. A. Nikolopoulos, E. P. Benis, and G. D. Tsakiris
