The Joint Accelerator Conferences Website (JACoW) is an international collaboration that publishes the proceedings of accelerator conferences held around the world.
V.D. Shiltsev, “General Approach to Physics Limits of Ultimate Colliders”, in Proc. IPAC'21, Campinas, SP, Brazil, May 2021, pp. 2624-2627. doi:10.18429/JACoW-IPAC2021-WEPAB017