The Joint Accelerator Conferences Website (JACoW) is an international collaboration that publishes the proceedings of accelerator conferences held around the world.
%\cite{kaltchev:ipac2021-wepab280}
\bibitem{kaltchev:ipac2021-wepab280}
D. Kaltchev,
\textquotedblleft{Two-Dimensional Beam-Beam Invariant with Applications to HL-LHC}\textquotedblright,
% --- abbreviated form (published paper) - JACoW template Feb 2018 ---
in \emph{Proc. IPAC'21}, Campinas, SP, Brazil, May 2021, pp. 3301--3304.
\url{doi:10.18429/JACoW-IPAC2021-WEPAB280}
% --- additional material -ISSN/ISBN--
% ISBN: 978-3-95450-214-1, ISSN: 2673-5490