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%\cite{Emma:FEL2017-WET01}
\bibitem{Emma:FEL2017-WET01}
P. Emma,
\textquotedblleft{Beam-based alignment of undulators for free-electron lasers}\textquotedblright,
presented at FEL2017, Santa Fe, NM, USA, Aug. 2017, paper WET01, unpublished.
% presented at the 38th Int. Free Electron Laser Conf. (FEL'17), Santa Fe, NM, USA, Aug. 2017, paper WET01, unpublished.