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%\cite{carlsten:fel2019-moc04}
\bibitem{carlsten:fel2019-moc04}
B.E. Carlsten,
\textquotedblleft{Accelerator Challenges for XFELs with Very High X-Ray Energies}\textquotedblright,
% --- abbreviated form (UNpublished paper) - JACoW template Feb 2018 ---
presented at FEL'19, Hamburg, Germany, Aug. 2019, paper MOC04, unpublished.