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%\cite{macarthur:ipac2021-frxa07}
\bibitem{macarthur:ipac2021-frxa07}
J.P. MacArthur, Z. Huang, J. Krzywiński, G. Marcus, R.A. Margraf, T. Sato, and \emph{et al.},
% J.P. MacArthur, Z. Huang, J. Krzywiński, G. Marcus, R.A. Margraf, T. Sato, and D. Zhu,
% J.P. MacArthur \emph{et al.},
\textquotedblleft{Ringdown Measured in a Four-Bounce, 20 Meter Hard X-Ray Cavity}\textquotedblright,
% --- abbreviated form (UNpublished paper) - JACoW template Feb 2018 ---
presented at IPAC'21, Campinas, SP, Brazil, May 2021, paper FRXA07, unpublished.