The Joint Accelerator Conferences Website (JACoW) is an international collaboration that publishes the proceedings of accelerator conferences held around the world.
H. Freund et al., “Theory and Simulation of FELs with Planar, Helical, and Elliptical Undulators”, presented at the 38th Int. Free Electron Laser Conf. (FEL'17), Santa Fe, NM, USA, Aug. 2017, paper FRB02, unpublished.