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%\cite{tsai:fel2019-mod01}
\bibitem{tsai:fel2019-mod01}
C.-Y. Tsai,
\textquotedblleft{Physics of Post-Saturation Tapered FEL Towards Single-Frequency Terawatt Output Power}\textquotedblright,
% --- abbreviated form (UNpublished paper) - JACoW template Feb 2018 ---
presented at FEL'19, Hamburg, Germany, Aug. 2019, paper MOD01, unpublished.