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%\cite{chaikovska:ipac2021-wexa03}
\bibitem{chaikovska:ipac2021-wexa03}
I. Chaikovska,
\textquotedblleft{Physics and Technology Challenges in Generating High Intensity Positron Beams}\textquotedblright,
% --- abbreviated form (UNpublished paper) - JACoW template Feb 2018 ---
presented at IPAC'21, Campinas, SP, Brazil, May 2021, paper WEXA03, unpublished.