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%\cite{shimada:erl2019-wecoybs06} \bibitem{shimada:erl2019-wecoybs06} M. Shimada, A. Aryshev, Y. Honda, T. Miyajima, T. Obina, R. Ryukou, \emph{et al.}, % M. Shimada, A. Aryshev, Y. Honda, T. Miyajima, T. Obina, R. Ryukou, R. Takai, T. Uchiyama, and N. Yamamoto, % M. Shimada \emph{et al.}, \textquotedblleft{Demonstration of THz Oscillation via Resonant Coherent Diffraction Radiation}\textquotedblright, % --- abbreviated form (UNpublished paper) - JACoW template Feb 2018 --- presented at ERL'19, Berlin, Germany, Sep. 2019, paper WECOYBS06, unpublished.