The Joint Accelerator Conferences Website (JACoW) is an international collaboration that publishes the proceedings of accelerator conferences held around the world.
D. Kaltchev, “Two-Dimensional Beam-Beam Invariant with Applications to HL-LHC”, in Proc. IPAC'21, Campinas, SP, Brazil, May 2021, pp. 3301-3304. doi:10.18429/JACoW-IPAC2021-WEPAB280