The Joint Accelerator Conferences Website (JACoW) is an international collaboration that publishes the proceedings of accelerator conferences held around the world.
Y.S. Li, K. Kim, and R.R. Lindberg, “Axial Symmetry in Spontaneous Undulator Radiation for XFELO Two-Bunch Experiment”, in Proc. FEL'19, Hamburg, Germany, Aug. 2019, pp. 134-137. doi:10.18429/JACoW-FEL2019-TUP038