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%\cite{Prat:FEL2017-FRA02}
\bibitem{Prat:FEL2017-FRA02}
E. Prat, E. Ferrari, S. Reiche, and T. Schietinger,
\textquotedblleft{Using the Optical-Klystron Effect to Increase and Measure the Intrinsic Beam Energy Spread in Free-Electron Laser Facilities}\textquotedblright,
presented at FEL2017, Santa Fe, NM, USA, Aug. 2017, paper FRA02, unpublished.
% presented at the 38th Int. Free Electron Laser Conf. (FEL'17), Santa Fe, NM, USA, Aug. 2017, paper FRA02, unpublished.