High-order harmonic cut-off frequency in atomic silver irradiated by femtosecond laser pulses: theory and experimentAnatoly V. Andreev, Rashid A. Ganeev, Hiroto Kuroda, Sergey Yu Stremoukhov and Olga A. ShoutovaEur. Phys. J. D, 67 1 (2013) 22DOI: https://doi.org/10.1140/epjd/e2012-30527-0