The Joint Accelerator Conferences Website (JACoW) is an international collaboration that publishes the proceedings of accelerator conferences held around the world.
X. Liang, M. Calvi, C. Kittel, N.J. Sammut, and T. Schmidt, “Advanced Operational Models of the Apple X Undulator”, in Proc. FEL'19, Hamburg, Germany, Aug. 2019, pp. 541-544. doi:10.18429/JACoW-FEL2019-WEP098