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%\cite{vartaniants:fel2019-mod03}
\bibitem{vartaniants:fel2019-mod03}
I. Vartaniants,
\textquotedblleft{Hanbury Brown and Twiss Interferometry at XFEL Sources}\textquotedblright,
% --- abbreviated form (UNpublished paper) - JACoW template Feb 2018 ---
presented at FEL'19, Hamburg, Germany, Aug. 2019, paper MOD03, unpublished.