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%\cite{williams:erl2019-wepnec18}
\bibitem{williams:erl2019-wepnec18}
P.H. Williams, I.R. Bailey, T.K. Charles, and G. Perez-Segurana,
\textquotedblleft{Analytic Longitudinal Phase Space Solutions for Multipass Energy Recovery Linacs}\textquotedblright,
% --- abbreviated form (UNpublished paper) - JACoW template Feb 2018 ---
presented at ERL'19, Berlin, Germany, Sep. 2019, paper WEPNEC18, unpublished.