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%\cite{yan:ipac2020-tuvir02}
\bibitem{yan:ipac2020-tuvir02}
X.Q. Yan,
\textquotedblleft{Overview of Low Energy Spread Laser Proton Accelerators}\textquotedblright,
% --- abbreviated form (UNpublished paper) - JACoW template Feb 2018 ---
presented at IPAC'20, Caen, France, May 2020, paper TUVIR02, unpublished.