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%\cite{Bencivenga:FEL2017-THA02}
\bibitem{Bencivenga:FEL2017-THA02}
F. Bencivenga, F. Capotondi, R. Cucini, L. Foglia, C. Masciovecchio, R. Mincigrucci, \emph{et al.},
% F. Bencivenga, F. Capotondi, R. Cucini, L. Foglia, C. Masciovecchio, R. Mincigrucci, E. Pedersoli, E. Principi, and A. Simoncig,
% F. Bencivenga \emph{et al.},
\textquotedblleft{Four-Wave Mixing Using Extreme Ultraviolet Transient Gratings at FERMI FEL}\textquotedblright,
presented at FEL2017, Santa Fe, NM, USA, Aug. 2017, paper THA02, unpublished.
% presented at the 38th Int. Free Electron Laser Conf. (FEL'17), Santa Fe, NM, USA, Aug. 2017, paper THA02, unpublished.