Reconstruction of few-fs XUV pulses with a perturbative approach Bruno Moio, Fabio Medeghini, Gian Luca Dolso, Giacomo Inzani, Nicola Di Palo, Rocío Borrego-Varillas, Mauro Nisoli and Matteo Lucchini EPJ Web Conf., 255 (2021) 11008 Published online: 18 November 2021 DOI: 10.1051/epjconf/202125511008