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%\cite{goryashko:fel2019-thd01}
\bibitem{goryashko:fel2019-thd01}
V.A. Goryashko, P.M. Salén, and G.K. Shamuilov,
\textquotedblleft{From Femtosecond to Attosecond Coherent Undulator Pulses}\textquotedblright,
% --- abbreviated form (UNpublished paper) - JACoW template Feb 2018 ---
presented at FEL'19, Hamburg, Germany, Aug. 2019, paper THD01, unpublished.