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%\cite{petrenko:cool2019-tups20}
\bibitem{petrenko:cool2019-tups20}
A.V. Petrenko,
\textquotedblleft{Laser Cooling at Ultrarelativistic Energies and the Gamma Factory Based on the LHC}\textquotedblright,
% --- abbreviated form (UNpublished paper) - JACoW template Feb 2018 ---
presented at COOL'19, Novosibirsk, Russia, Sep. 2019, paper TUPS20, unpublished.