[n] D. Kaltchev, “Two-Dimensional Beam-Beam Invariant with Applications to HL-LHC”, in Proc. IPAC'21, Campinas, Brazil, May 2021, pp. 3301-3304. doi:10.18429/JACoW-IPAC2021-WEPAB280
%\cite{Kaltchev:IPAC21-WEPAB280} \bibitem{Kaltchev:IPAC21-WEPAB280} D. Kaltchev, \textquotedblleft{Two-Dimensional Beam-Beam Invariant with Applications to HL-LHC}\textquotedblright, in \emph{Proc. IPAC’21}, Campinas, Brazil, May 2021, pp. 3301--3304. \url{doi:10.18429/JACoW-IPAC2021-WEPAB280}
@inproceedings{kaltchev:ipac21-wepab280, author = {D. Kaltchev}, title = {{Two-Dimensional Beam-Beam Invariant with Applications to HL-LHC}}, booktitle = {Proc. IPAC'21}, pages = {3301--3304}, paper = {WEPAB280}, venue = {Campinas, Brazil, May 2021}, publisher = {JACoW Publishing, Geneva, Switzerland}, doi = {10.18429/JACoW-IPAC2021-WEPAB280}, url = {https://jacow.org/ipac2021/papers/WEPAB280.pdf}, language = {english} }