The Joint Accelerator Conferences Website (JACoW) is an international collaboration that publishes the proceedings of accelerator conferences held around the world.
Y. Li and R. Rossmanith, “A Superconducting Undulator With Variable Polarization Direction for the European FEL”, in Proc. FEL'19, Hamburg, Germany, Aug. 2019, pp. 499-501. doi:10.18429/JACoW-FEL2019-WEP076