The Joint Accelerator Conferences Website (JACoW) is an international collaboration that publishes the proceedings of accelerator conferences held around the world.
E. Schneidmiller, M.V. Yurkov, “Reverse Undulator Tapering for Polarization Control and Background-Free Harmonic Production in XFELs: Results from FLASH”, in Proc. 38th Int. Free Electron Laser Conf. (FEL'17), Santa Fe, NM, USA, Aug. 2017, paper MOP032, pp. 106-108, ISBN: 978-3-95450-179-3, https://doi.org/10.18429/JACoW-FEL2017-MOP032, 2018.