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%\cite{yokoya:ipac2021-frxx01}
\bibitem{yokoya:ipac2021-frxx01}
K. Yokoya,
\textquotedblleft{My View on the 5 Most Beautiful Formulae in Accelerator Physics}\textquotedblright,
% --- abbreviated form (UNpublished paper) - JACoW template Feb 2018 ---
presented at IPAC'21, Campinas, SP, Brazil, May 2021, paper FRXX01, unpublished.