The Joint Accelerator Conferences Website (JACoW) is an international collaboration that publishes the proceedings of accelerator conferences held around the world.
F. Wolff-Fabris, Y. Li, and J. Pflüger, “The Magnetic Field Integral Hysteresis on the European XFEL Gap Movable Undulator Systems”, in Proc. 38th Int. Free Electron Laser Conf. (FEL'17), Santa Fe, NM, USA, Aug. 2017, paper WEP054, pp. 522-524, ISBN: 978-3-95450-179-3, https://doi.org/10.18429/JACoW-FEL2017-WEP054, 2018.